OK, here are the rule changes for the semi-finals:
1) Grappling rules are updated based on FAQ and RotG rulings - no natural 1's or 20's, but all natural weapons can attack at -4 while grappling
2) No camping in the VZ in any plane other than the prime material
3) Creatures have the option of teleporting into the arena or entering from their side of the arena using a move action or five-foot step. Large or larger creatures cannot deliberately squeeze just to simulate a five-foot step into the arena, they must move enough for their entire space to enter.
4) If a creature is physically blocked from entering the VZ for any reason, the time limit to enter is extended as long as the creature makes a valid attempt to enter the VZ every round thereafter.
5) Pre-buffing spells and abilities can be cast on the creature or the creature's equipment before they enter the arena. For simplicity's sake, anything that normally lasts 3 minutes or longer will be assumed to have been cast, with 2 minutes subtracted from the duration. Any spell or ability with a shorter duration must be cast inside the arena.
6) The VZ is changed to a 20 foot wide vertical strip with a 20 foot high roof. The strip occupies the squares from 20N to 95N and from 50E to 65E. There are support posts at the following vertices - 20N50E, 20N70E, 60N50E, 60N70E, 100N50E & 100N70E. A spreadsheet depiction of the arena is attached.