We just updated with a blog about the 'knowledge unlock' mechanism we're implementing in Toki Tori 2. We're pretty excited about it, and believe it's going to set Toki Tori 2 apart from other titles in the genre.
Direct link: <a href="http://twotribes.com/message/toki-tori-2-update-17/">Update 17: Knowledge Unlocks!</a>
Chances are you're still working your way through Toki Tori, but in the mean time we're working hard on the sequel. We've reached a point where the game becomes playable, and have put that build live on Steam.
Check out <a href="http://twotribes.com/message/toki-tori-2-update-12/">Update #12</a> for details and a video of the build. If you haven't enlisted yet, go to <a href="http://twotribes.com/message/help-us-make-toki-tori-2-great/">our site</a> for the details and get a development build too!