I got the email too. This is the strangest product shutting down (non)-announcement I've seen from a startup. I think most startups could do with a crash course in how to communicate with their users.
Given all that's been written about the importance of user feedback, most founders are very responsive now when they start - what with stalking visitors with Olark accounts, replying to emails and tweets within seconds, answering questions on social news sites. All is great when they want to benefit from the users' comments. But as soon as that's no longer the case, they treat users like a commodity and don't seem to care about telling them what's going on or what to expect next.
It doesn't bode well for their future projects.