I looked back i few posts to see that you guys wanted a solid netcode plus a good grapics engine. Well while u might still chose UT2K I am positive that if you had it made for Battlefield (in some way, since it supports classes).
It can support
. Vechilicals ( um i spelt it wrong)
. Classes
. 64 people ( most likley 40)
. Bots
U guys dont have to make another U4E for it but maybe a possible U4E fortress and some extra models Like the battle of Mars which has the Aliens vs. Humans and velichales (yes i know) like The u4e Tank and instead of anti air guns, how about mounted railguns or vulcan cannons. PLZ chose Battlefield instead or do a class version for it to