Klingons have been promised a Rank 4 Marauding uniform since... forever. So don't hold your breath waiting for a Romulan one.
Take a close look at the Marauding reward tables. All mentioning of a marauding uniform has been removed sometime during last year. We will never get this uniform. Heck we never even got the Embassy Robes. It's been several month since KDF fleets unlocked the Embassy tailor and we never got access to what we grinded for, and we probably never will. This game is all about Starfleet.