I imagine they are having some last minute problems and are late...
Nothing wrong with them they will send this invitation only to selective and random people. We have to wait for further announcement because this is very big project and this kind of delay is nothing to get worried.
I believe I could count as one of the first to request invitation...But even if I don't get invited I like to know that someone at least one person in this community received, that's not too much to expect.
I received an invite to testnet but I didn't take the opportunity to test it out...
Am I still eligible to sign up with my email link? Or is registrations closed?