Difficult to see, always in motion the future is, but consider these two scenarios, Jedi Master Luke and Jedi Knight Luke.
From a marketing POV, JM Luke should happen in December, its the perfect time to do it with "The Last Jedi" comming out etc. If we structure the event akin to the first "A Hero's Journey" we will have to have 5 characters at T7, the likly suspects are Poe, BB-8, Rey, Finn, and Artoo. They are all resistence and they all play a role in Ep VII. Also they have been out for extended time, except BB-8, but considering he has an event just now, that that mirrors the Artoo situation last time. Also Artoo is along to fill out the roseter with named resistence characters and also because he gets an event at the end of October. I think a BB-8 event will happen at the end of Novemberm then the JM Luke event middle of December.
Some have brought up Smuggler Hand and Chewie, but they are not resistence or have leader abilities, which means they will be hard to do synergies with for the design if the battles, either with other resistence characters or the two of them alone, also they are not f2p charaters yet, all this why I have not considered them, if we do not get a JM Luke event in conjuction with the movie, then I will have to revise this list with Han and Chewie in mind. So why Artoo, casue he is resistence, and he is the one character intimitly linked to the whole SW Saga, specially the Skywalkers, think of him as the thread that holds everything together.
If they are to use the eight battles/scenes as last time, then I beleive they will be something like this:
1. Poe and BB-8 vs First Order, at the village on Jakku. Poe is captured in end cut scene.
2. BB-8 and Rey wander the desert and have to fight vs scoundrels, and/or jawas.
3. Finn and Poe vs First Order, on board the Battlecruiser "Finalizer" end with Tie Escape scene.
4. Finn, Rey, and BB-8 at Niima Outpost fighting Scoundrel trying to steal BB-8
5. Rey, BB-8, and Finn on Takodana at Maz Kanata's castle, vs First Order, Rey is captured at the end.
6. Finn and BB-8, vs First Order, they are trying to rescure Rey abord StarKiller base.
7. Rey vs Kylo Ren outside in the forest on StarKiller Base.
8. Rey, BB-8, and Artoo vs FO on Ahch-To, fighting (?), to get to the top of the First Jedi Temple.
For a JK Luke, I think we will have a different setup, there I believe the characters needed are CLS, Artoo, ROLO, Hermit Yoda, and Lando. Again we are using the 8 battle scenes structure. I chose not to include Han due to him having limited role in the development of Luke becomming a Jedi, and also because the only ingame character that matches Cloud City Han is Raid Han. Besides, han doesn't really fight on CC in the movie. ROLO is very close to CC Leia, as it is the same costume minus the outer jacket and different hair due. Including Lando is because he is instrumental in the escape of the rebels, and subsequent rescure of CLS, and he sort of is the "old meta" of this part of "A Hero's Journey"
1. CLS and Artoo on Dagobah looking for Yoda and have to fight their way through the jungle.
2. CLS and Yoda fighting vs jungle creatures as a stand in for training montage.
3. CLS vs Darth Vader in the dark side cave on Dagobah. CLS defeats Vader to reveil it was an illusion.
4. CLS, artoo, and Yoda again vs jungle creatures, ends with Yoda raising the Xwing, and the "Do or do not".
5. CLS and Artoo on cloud City in persuit of Boba Fett and Stormtroopers who have ROLO and Lando.
6. Lando and ROLO fighting against Stormtroopers and meet up with Artoo at the end.
7. ROLO, Lando, Artoo, escaping Clound City fighting vs troops.
8. CLS vs Darth Vader, round two, and this time it is for real, you have to survive a set amount of rounds before the climactic end scene with Luke escaping, and being rescued.
There are mulitple issues with this scenario, as there two hard to get Characters ROLO and HY. This leads me to think they will wait with this scenario until next middle of 2018, and instead go with the first one.