There won't be a "soon-to-be-released new version." That I know of anyway
There are some great mods out for the game (just go to the modding forum and check out the stickied threads) that improve it and add different items, etc. There are enough people playing to get in some games, though, but the community is small.
I'd say pick it up - definitely if you liked the demo. Its a very fun game imo.