Exponent is now using Launchpad.net to help centralize development efforts. If you're looking to get involved in the project, you'll be able to join the Exponent CMS Community Team and sign up for the Exponent Mailing List, View Exponent Codelines for both 1.0 and 2.0 version, and File Bug reports.

Here's some useful Launchpad Links

Exponent on Launchpad Project Homepage
https://launchpad.net/exponent-cms

Exponent CMS Community Team
https://launchpad.net/~exponent-cms
Become a member of this team and sign up for the mailing list

In the coming weeks, we'll be informing the community how you can get more involved to help make your favorite cms the best it can be. So make sure you get yourself a Launchpad account and sign up for the mailing list to keep yourself informed of the latest Exponent developments.