As far as Vet Rewards I imagine it would depend on how much time they have to get anything done by launch. I wouldn't count on it, though - especially since you will get to use an ally's version anyway.
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.
I would be very disappointed if over the course of the next year the Romulan Faction is not given it's own "C-Store" Stuff...
Romulan EV Suit
Romulan Bridges and Interiors
Romulan Odyssey/Bortasque Variant
Romulan 1000 Day Ship
Romulan Access to Captain's Table
Unique Romulan Melee Weapon
Although I could very easily see someone pointing out that since a Romulan character chooses Starfleet or KDF at Level 10 and they would thus have access to which ever sides Vet Rewards they do not need their own...
Admiral Jisil T'ror
“Does anyone remember when we used to be explorers...”
Yes I know about the alliances and all, but even with that, they need to have their own Veteran and Timeships. At least. I mean, Romulan, KDF, and Federation Timecops battling it out? Now that's a temporal war!!!