One thing I think the GR faction will be lacking in is large ships, so let's speculate on what they might get.
The well known LAAT gunships seem more likely to be medium-base if we get them in game. I don't think they'd go to large unless they'd use the vehicle transport variant, which seems unlikely.
Both the Nu-class and Theta-class shuttles are just a bit smaller than a Lambda, so they are good candidates. Neither were particularly well armed so I feel like they are about as equally likely. The Eta-class shuttle also exists but is a fair bit smaller and would likely fit in more appropriately as a medium. There's also the Kappa-class shuttle from Legends but it feels unlikely to be introduced in game. It's just a bit smaller than a VT-49.
It's also arguable that the Bad Batch's Havoc Marauder could show up but I assume that would be a title for some shuttle with a class designation, even though it doesn't quite fit any of them.
Also from Legends, the PTB-625 planetary bomber is another contender for a large ship. The few sources for it do list at as an air-speeder rather than a space-faring craft but as its currently canon, LFL might be willing to overwrite that, and we have only the one image of it. They also could make it the NTB-630, which we don't have any images of, and which is said to be a very similar craft.
EDIT: Somehow I forgot about the GR-9 Rigger, best known as the Twilight. It's arguably the most likely candidate for a large ship even if some number of fans really hate the design.
Edited by CaptainIxidor