For all intents and purposes, the Guramba is our 'Nausicaan escort', as it functions like a raptor/escort when not in siege mode. If they were to add another ship, it'd be something like a carrier or a battlecruiser.
But the Nausicaan escort is a nice design. I can see it coming in game as somekind of a "glass cannon" maybe to counter the Kumari on some level. But the question is wheather Cryptic sees it like that.