Thanks for not putting two question marks in your title like you always do...though I see you still managed to double them up in your post.
Revned
initiated a project to get a bunch of mappers involved with this colossal game nearly two years ago, but now it's just Revned, and he says he'll finish the first castle somewhat soon, but he has said it is unlikely that he will do the second castle. Or something like that. His last update (at least in that topic) was half a year ago...
I might as well just close this topic because we don't need two about it.
Also, RT 55J very recently made
a topic tracking the progress of this and all other Castlevania games.