White2/Black2 are currently on sale for $44 at JB. Which prompted my question. I haven't even opened my copy of Black. Considering not doing so, selling it, and getting Black2 now.

From the sounds of it (the national pokedex, more legendary pokemon, adjusted gyms) Black2/White2 really is "Pokemon Grey" but they've two games lets them get a bit extra cash.

With X/Y I might be smarter and hold out until Pokemon Z comes out