SketchFactor of Bungie has a new PC Halo update over at Bungie.net; the playtesting has begun in earnest:

After hearing Michel's report last week, I had to try out some team Crazy King on Gephyrophobia. Man, talk about intense! One of the King zones appears right in the middle of the lower platform. You've got people firing and throwing grenades from above, Ghosts blazing full speed on the ground and Banshees strafing from the skies. Just when I get a foothold and start to accrue time... BAM!... the zone moves. This time, the zone is up on the middle level in between two stationary turrets. If a team plays together, it's devastating to have a few players inside the zone and a few others manning the turrets. Turrets are your friend. Another thing I've learned the hard way on this map - if your team doesn't maintain a presence in the skies, you've all but lost. Banshees are very effective at disrupting ground movement and causing havoc with their secondary attack but I've found the most satisfying way to eliminate an enemy is to simply ram him at full speed.

The update has a few more gameplay tips on the new maps, check them out.