The new rules are online: http://www.ludumdare.com/compo/rules/
Basically, Ludum Dare splits itself up into two categories:

- Competition
Everything we knew and loved about Ludum Dare: You have 48h to create a game by yourself, everything from scratch* and you have to publish the source code afterwards.
*but you can use an engine or a framework or your own basecode

- Jam
This one is new. You have up to 72 hours to create a game, teams are allowed and you can use any assets you want. You don't have to publish the source code of your game.


Competition entries will be judged, jam entries won't. If you enter the jam you are allowed to judge competition entries.