ES Samples have been circulating since September 2009 or so, I think I got my first one in October, so it's been a while. Retail launch of this particular CPU will be March 16th, so it's not that far off.
Include them if you like

You are right, Intel broke their consistent naming scheme for this one. While the whole LGA1366 32nm Lineup (Quads and Hexas) with Hardware AES Support falls under the "Westmere" family (Tick - Tock, Nehalem was Tick, Westmere is Tock), Gulftown is the codename for single QPI desktop parts, like Bloonmfield was for the i7's.
Westmere-EP is the successor of Gainestown, they were probably looking to put that in line with the later-to-arrive Westmere-EX (<-> Nehalem-EX/Beckton successor).