It's in alpha testing atm. It isn't out. You actually need to pay $150 for a founder's pack to get into the alpha.

I played the Alpha test for a bit. However, since there's only 1 alpha server, literally all of the land available has been claimed. Supposedly there's over 3x the intended maximum amount of players on the alpha server. So I have no hope of building a house in alpha, so I stopped playing.