IGN's got the details. ET:QW will be at E3 in force, & by that I mean that if you're lucky enough, you may just be able to get in on the 24 player LAN they'll be running :o

"This is no half-assed attempt to show off the multiplayer here. The Activision booth will house a 24 player LAN that anybody at the show can walk up and test out assuming they can break through the ridiculous crowds that will undoubtedly gather around the area."