I'm curious if the Romulan faction will just be a "guild" and not a true faction. Rather than build the faction from the ground up, just create a bunch of endgame content and allow your characters to "defect".
Defectors would be canon.
Or possibly a hybrid of this. You can create a character at level 50 in RSE and play said content, or buy a C-Store token and defect a level 50 character with all their stuff (except maybe a few things like your fleet) to RSE. The token would also work in reverse and transfer them back to Fed/KDF.
Whatever the case, I just hope the RSE isn't a piecemeal load of trash.
I am the STO Lorax. I picked myself up and left, until the day the fun is replanted.