There, you will be notified when the public alpha server and client are updated. This test doubles as a demo. This is what I believe Early Access should be: there's a free demo for you to follow along the game's development, and if it is going the way you like, you would decide to buy the final product off Steam. With all the bad Kickstarters and Early Access projects lately, I hope this is a reminder of how speculative game development used to work.
I got a notice that an alpha download was added and just went to blogs and posted on the latest one, which seemed to match :P There was no date because nobody posted a comment and RMN shows the blog dates weird.
I did just add the link though- its the same one as the Steam group and I thought I might as well add it here because its hosted offsite anyways (I remember that requirement being in rpgmaker.net's ToS for commercial games).