Well, Fleet Advanced Research Vessel Retrofit can be considered cruiser-ish. It's still one of the better tanks in the game, frequently used by engineers in PvP.
But seriously, there's just not many more cruisers left. The Excelsior has its issue of integrated Transwarp, which Cryptic is against giving away for "free" in a Fleet ship, while Fleet Cruiser Retrofit simply won't happen due to its size.
But expect (Fleet) Ambassador to appear on this tier. The ship is pretty much confirmed to be the 3rd anniversary feature episode event goodie (not saying it'll be free) and assuming there would be a fleet version it would probably appear on Tier 3, before Tier 4 Galaxy.
And the Fleet Assault Cruiser Refit was Tier 5 before it was removed from Tribble, FYI.
Hi thanks for the info about the Fleet Assault Cruiser Refit, I had thought it strange that there wasn't a Fleet Module Ship at Tier 5, long way off but never mind. As the Metreon Cannister references the Fleet Assault as a ship it can be fitted on it does seem an obvious gap in the game. Some equipment references it but the actual ship not there....?
As for the Excelsior if it were done as a actual FLEET designation this would require a Fleet Module and therefore would not exactly be a 'free' giveaway. Fleet Modules needing to be bought with Zen, wether then stuck up on exchange or not.