To quote from the Glitch Twitter feed:
"There are a few tests coming in the next 10 days & at least one of them will include a batch of new invites." - June 26th 2010
Now, if I read this correctly, 'few' is plural, and since the 26th there has been only one test session (and it didn't contain new invites as far as I'm aware). 10 days from the 26th is today, which means that if you are true to your word there should be a test today :D
Please, please stand true to your word. I'm itching to play again!!