I was unable to find much about it on the internet either. I did find this short write up on the University of Maryland School of Theatre, Dance, & Performance Studies page: http://tdps.umd.edu/news/conway-posner-and-teller-team-tempest - I'll keep an eye out and post anything else I find. Following Teller on Twitter is a good idea, also (if you don't do so already). I hope this helps some.
Yeah, that page is all I could find as well. It seems like they were saying it was gonna be happening pretty much any time now, so you'd think there would be more info out there.