That Mortis Vision of Ahsoka needs to be discarded completely. Dave Filoni was not sure that he would have Ahsoka leave the Jedi Order back then, so that is why she was wearing the outfit she wears in Clone Wars. The Rebels Version of Ahsoka is a Way Better Version of Ahsoka as an Adult than the Mortis Vision. The Mortis Vision was meant to warn Ahsoka of her future as Anakin's Apprentice, Rebels Ahsoka had actual Character Development as Ahsoka in Clone Wars did, that Vision was a Warning.
The reason why Ahsoka looks so Different in Rebels is because she is about 30 Years old, 14 years older after leaving the Jedi Order. Not only is it a Different Art Style, but she is 14 years older in Rebels than we last saw her in Clone Wars. Ahsoka in Rebels is a very accurate Version of what she would look like as an Adult, they did a good job of making her look older. They changed her Tattoos but they still look Similar, maybe she changed them herself, also, she doesn't wear a Green Crown anymore, she wears a Red, Gold, and White Crown probably over the Green one she used to have. She also wears a Cooler outfit in Rebels than she does in Clone Wars. Because she left the Jedi Order, she is now a Neutral Force User, neither a Jedi, nor a Sith. But still good. She uses White Lightsabers to symbolize that she is no Longer a Jedi nor a Sith. She is still Very Acrobatic in Rebels just like she was in Clone Wars. She fought Vader in Rebels, there is a scene while she is fighting him where she does 2 Back Flips while fighting him. She is still Very Acrobatic.
There are other scenes where she is Acrobatic but that is my Favorite from Rebels. She looks Awesome as an Adult and they did a fine job making her look like an Adult. Her story in Rebels is about Discovering who Vader is, and she feels Immense Guilt about leaving him and the Jedi Order once she discovers who he is. Ahsoka has evolved a lot from the age of 14, to 16, to 30. And it is a Cool Evolution. She is very Skilled in Rebels. Ahsoka in Rebels is Ahsoka at her Strongest and most Powerful. She has had more years to Improve her Lightsaber Skills and get more Powerful with the Force. I would reccomend at least giving the episodes of Rebels that have Ahsoka in them a try. Rebels is not as Childish as you think, it's not as good as Clone Wars, but still good and worth watching, Teen Titans Go is only for Children. Not Rebels. Rebels takes place after Clone Wars and Revenge of the Sith and before Rogue One and the Original Trilogy. It's a Great show. If you think Ahsoka is skilled with 2 Lightsabers in Clone Wars, you should see how skilled she is in Rebels. She is skilled with 2 Lightsabers in Clone Wars but you should really see how skilled with them she is in Rebels. I promise you it's worth it. It's still the same character and still the same Actress. People on YouTube have made Sad Emotional Tributes about her discovering who Vader is and Show footage of her from both Shows. They show how much she's grown up. Some really good ones include: Star Wars: Ahsoka's Journey - Story Tribute by ALPHA vs B3TA, Ahsoka Tano, the Chosen Padawan for the Chosen One // See What I've Become by Sneaky Snips, Ahsoka + Anakin - It's What Goes On In Here That's Hard by trulyfabulouskilljoy, and Ahsoka/Anakin/Vader - RED - Part That's Holding On by Jonde.
One of the most Intriguing storylines in Rebels is Ahsoka blaming herself for Anakin's Fall to the Dark Side. Why? Because she left, and this Guilt Tears her apart, making her more of a Tragic Character. I would recommend watching the Episodes Fire Across the Galaxy, she makes an Appearance at the end, The Siege of Lothal, The Lost Commanders, Relics of the Old Republic, The Future of the Force, that is a really good one, Shroud of Darkness, The Mystery of Chopper Base, and Twilight of the Apprentice from Rebels. Fire Across the Galaxy is from Season 1, the rest are from Season 2 of Rebels, and if you want to see Ahsoka fight Vader, I would recommend giving Rebels a try. Don't expect the fight between Ahsoka and Vader to be Too Long, though, and if you give Rebels a try, don't expect an Exact Answer of what happened to her after fighting Vader, her Fate has been left Anonymous. Which, again, makes her more of a Sad and Tragic character, if you like Ahsoka, and want to see the end of her story so far, I would recommend giving Rebels a try, just watch the Ahsoka episodes, it is a Sad and Powerful Story, don't watch all the episodes if you don't want to give Rebels a try, but at least watch the episodes that have Ahsoka in them, it is Totally worth it. Clone Wars is still Better than Rebels, but Rebels is still a Great Show. And there are Deaths in it like Clone Wars. Rebels is not all Happy Happy. It gets Dark at times. And if you do watch the Ahsoka Episodes in Rebels, I wouldn't watch those YouTube Tributes until after. I promise you, she's Awesome in Rebels, she is still a BA, don't worry.
One of her Most Memorable Quotes from Rebels is "I am no Jedi." I grew up with this Character for 8 Years, so she is my Favorite Star Wars Character. Ahsoka will look Different in Rebels, but it is still the same Character, voiced by the same person. She's just an Adult in Rebels. Not a Teenager. And I promise you she looks Awesome with those White Lightsabers. She mentions several times that she left the Jedi Order in Rebels, they didn't just drop her History. She is not a Main Character in Rebels, she is a Supporting Character, but she is still Awesome. There is also an Ahsoka Book that explains how she got her New White Lightsabers that takes place about a year after Revenge of the Sith, and if you know about The Siege of Mandalore Episodes she would have participated in the Very Last Episodes of Clone Wars of Season 8, that story is in the Beginning of the Book. Ahsoka's story is Very Sad, she left. I know so much about her because she is my Favorite Character. Rex also makes a return in Rebels, so if you like him, you'll like that, but he's Old because Clones age Faster than People.
Honestly, we'll be Lucky if EA even gives us one Version of Ahsoka in Battlefront 2. Star Wars Fans Assume both of the Shows are only for Children because they're Animated, but they're not. And there has been no Confirmation that they will include content from the Shows as well as the movies so I am losing Hope. But, the more Content this game has, the Better, but not everybody agrees. I will be surprised if we get any Characters from the Shows, honestly, they could add them in as a later Free DLC, but I don't know. It would be Nice to get Both Versions of her, as one is more Powerful and would be a Perfect Rival for Vader, while the other one could be playable in The Clone Wars Era, but I'll be surprised if they put her in the game in General.