Community Manager Evan "Scapes" Berman just took to Reddit to let the community there know that Head Start is undergoing final rounds of network checks, and that founders will be allowed in "soon". No ETA, but hopefully you won't be waiting forever!
Keep your eyes peeled to the forums, Twitter, Facebook, Reddit, or whatever you prefer and I'm sure we'll all be rushing to our farms and houses before long.
EDIT: Just confirmed with CEO Scott Hartsman as well, that Login Congestion will be easing as people fill the servers and stop hammering the login queue. Hang in there!