I tried to join somebody's session who had it and it gave me the option to download the full game. I wanted to try the beta to see if i like it, is there a beta??
There is an awesome trial that gives you a great taste of the game, and a long one, at that. It's just what you're looking for.
But you'll have to wait for the official launch for that!
The sneaky early trick only works for buying the full game.