According to a Neogaf poster who claims he saw Banjo at a press event two weeks ago, a press embargo is to be lifted on the game on May 13.
I went to Rare to see the game two weeks ago and let me just say that this is the biggest evidence of the return of great Rare I've seen in quite a while... and the teaser site will all make sense, when the game is unveiled (embargo is lifted the 13th of may).
Imagine us doing massive winks. See that? Massive winks. Massive ones.