"These are test sessions right now. The game has just moved from Alpha testing to the Beta stage (about April-May). During this time they shut the game down to review and do code fixes to get the game ready for final release. Right now they are about to do some significant changes and such and the servers will be down until August 11th. :( But unlike many previous tests the next one will be a full week. But stick around in these forums for a while and learn a few tricks"
Yep. In fact, I saw that you just posted in a thread that mentioned when!
August 11th (Thursday), time unknown. Open for a week after that. (All of that is of course subject to change.)
Places to check are also the @isglitchopen and the Glitch Facebook page.
The time is unknown, but the date is already posted in this forum and several other places online. It will open (probably sometime in the afternoon of PDT), August 11th and remain open for an entire week. This will be the longest it's been continuously running so it's a good sign it's approaching final release.