Well the image just updated to the full release image. So I went ahead and copied/pasted the new key onto steam over the top of the one I just started downloading - it said I already own the game... So I am guessing it was and still is the full release version as it didn't start doing a new download or anything.
Also, my download for the full game is 7.2gb - can anyone confirm that that is the size of their full release version?