Well, at least everything they have told us so far.
Fizban30 w/ help from king0rism have assembled all publicly known information regarding BF2 in a single location. This includes basic information, map info, weapon and vehicle details, videos and screenshots. Here is a portion of the information under “Basic Info”
Basic Info
* Release Date: 03/24/2005
* Demo possible in Feb., not confirmed
* 64 players max, 30 vehicles, 11 maps, 7 classes
* U.S. vs Chinese, vs Middle East Coalition
* New gameplay engine, realistic physics and dynamic lighting, Material penetration feature, destructible environments
* Maps scales to number of players (16, 32 or 64 players) and provides ideal vehicle-to-player ratio
* Native PunkBuster support
* CTF undecided
* SP is beefed up
* Requirements will be around – 1.4GHz, 512MB RAM, shadermodel 1.4 supporting gfx card
* Ingame Squads –
o Squad leader can use T key to issue commands
o Squad leader in a vehicle becomes a mobile spawn point for squad members
o Can be password protected
o Max of 6 players and leader
o Squad leader can set waypoints
o Temporary spawn points can be made
The site can be found here and is “under construction”, but is pretty cool.