Best Buy had this listed very briefly on their Canadian web site:
“Interactive and synchronized light and smoke stage show for Rock Band on the Xbox 360”
The listing has now been taken down, and the only other reference I can find to it is on a GameStop page (sans picture) here, but if this is the real deal then life just got a whole lot cooler. The release date on the GameStop page – June 28, 2008 – matches the date that was on the Best Buy page, so hope certainly springs eternal.
Please please please let this be true …