Telltale has set the release date for Puzzle Agent 2 to June 30th. The sequel to last year's Nelson Tethers: Puzzle Agent (reviewed by Mojo here) will see Nelson encounter new puzzles as he continues his investigations. Along with the release date, Telltale has opened up their store for pre-orders and if you order Puzzle Agent 2 before release, you will get the original for free. Just follow this link.
Can't wait for the 30th? Telltale is also running a contest where five people get the game two weeks early by writing funny captions to some pictures from the game. Full details on how to participate in the contest can be found in this blog post.
Telltale also released a teaser earlier this year which you can view below:
EDIT: Including the Sam & Max Blowout Bundle! :D