http://robotwars101.org/ants/rules.htm
The changes are the result of the discussions which took place at the end of last year. The changes have all been agreed by the AWS committee. The result of most of the discussions was actually "we already have a rule for this, nothing needs to change".

The major changes are as follows:
2a: The rules now provide guidance for weight limits for clusters of more than 2 botlets.
3a: Battleboxes should now use 4mm polycarbonate minimum
4h: If one robot leaves the arena before the robots have made contact, the judges will decide whether to restart the fight or award a win to the robot remaining in the arena.
5e: Tech checks to include size, weight, link/switch, failsafe, name, sharp edges.
5j: Only drivers or designated officials may remove robots from the arena after a battle