Disney showed this at San Diego Comic-Con last week as a surprise at the end of a session regarding a new "Witch Mountain" movie they're doing (does anyone under 30 even remember the Witch Mountain movies?). Apparently, the scenes with Bridges were filmed in secret with a tiny crew so no one would know they were working on it.
As it stands, this is considered more a proof-of-concept than a trailer. Obviously, Disney liked it well enough to give it the green light.
Here's a good write-up on it:
http://jimhillmedia.com/blogs/jim_hi...-for-tr2n.aspx
Hopefully, someone will have a better version of it up soon (preferably Disney will post a high-quality version of it somewhere).