@TheSprinter85Yeah, my name here is a bit long! I was messing about with the name there, trying to come with something clever and just made it awkward! XD
It would certainly have new maps. If it used GW and GW maps, we'd have 6 Gardens and Graveyards maps and only 3 Herbal Assault maps, so they'd need to balance that a bit (I'm not differentiating the night and day versions here). I want so many maps added that it's unrealistic (seriously, like 100 new maps would make me smile), but a more realistic number, like 4 new TT maps and at least 8 of the smaller ones would be a good start, with more added over time. They could bring the smaller, non-TT maps forward from BfN, even if a lot dislike Oozevoir (Time Park is my least favorite map to this day though), but for the BfN TT maps, they'd need to make some changes, and Tourist Trap Island would need a rework, especially on the final minigame as just pushing a switch back and forth is not as enjoyable or interesting as any of the others.
For the veteran rewards, I was thinking mostly coins. Nothing major. Just a nice little thank you for getting the other games and more if you leveled higher. Kind of like the GW2 veteran rewards although with no time limit if possible.