I'd just like to say, if they do make it a First Order-based meta with TLJ, I'd not only be okay with it, I'd be overjoyed. First Order is already one of the most entertaining factions in the game (even when it's a against me, I can admit that an auto leading to 4 follow-up autos is just funny).
However, I'd also quite like for us to get some of the Troopers from Hoth TB to use. They seem like, with a few tweaks, they could genuinely be a good way to give Empire teams a fighting chance against Rebels.