It's just SA:MP, yeah.
I doubt we'll move over to SA:MP, the lack of Velocity functions means we can never recreate MTA:Race on there, most maps wouldn't work at all.
What we have talked about is an MTA:DM (Or 1.0, whatever) server, obviously running the race mode.
It just didn't hasn't taken off for now and quite frankly, I wonder if they'll ever release a finished version, but we'll see.