Face it, even though you don't know what the game is you want to sign up for this anyway.
Mojang’s upcoming game Scrolls has been in the gaming news quite a bit lately. Most recently the Minecraft creator won an interim injunction against ZeniMax and Bethesda concerning rights to the name Scrolls. While the legal battle is likely far from over, this little victory is an important one as Mojang can now more freely market and talk about the game. Perhaps he'll even tell us a little more about this Alpha signup that just went up.