These are the re-issues that have been delayed. I believe the blog stated that the Enterprise-B is not merely a repainted version of the previous verison, it's new. Not sure what is new about it yet, but they have stated it won't be the same ship.
The last ship in this line will be the Excelsior, have no idea when that is coming out though. Probably fourth quarter of this year. Art Aslyum also stated they have no idea yet what future ships they will be pumping out. I suspect they'll announce this at Toy Fair or something like that.