Roms are on tribble, but only those invited can access them. You can still test Fed content, and see/test the new UI, new Warp Cores, etc. There's still plenty of Season 8 things that need to be tested besides Roms.
STO is about my Liberated Borg Federation Captain with his Breen 1st Officer, Jem'Hadar Tactical Officer, Liberated Borg Engineering Officer, Android Ops Officer, Photonic Science Officer, Gorn Science Officer, and Reman Medical Officer jumping into their Jem'Hadar Carrier and flying off to do missions for the new Romulan Empire. But for some players allowing a T5 Connie to be used breaks the canon in the game.