The Alpha version will come up in summer ...
But do somebody know HOW it comes out? I suppose it's digital version to download for those who have access to it, thanks to the "value of pledge" they did ?
My guess would be a download protected by an "insert your alpha access code here to download." You would then of course get that code as an email. That's the simplest solution probably.
There will apparently also be an alpha testing forum somewhere, so maybe they also can tie the downloads somehow to the accounts that have access to the alpha forum, don't know.