WILL THERE BE MULTIPLAYER???
as I stated above there WILL NOT be multiplayer, but an older version of the net code will still be there. Which means for a mod team to add in MP it may be as simple as adding spawn points 'n stuff (unlikely) to having to completely revamp the multiplayer code due to the massives differences between Unreal 2 and UT2k3 (the source of the net code).

WHAT ARE THE MINIMUM REQUIREMENTS???
The minimum spec is a Pentium® III or AMD Athlon 733 MHz or higher (Pentium® or AMD 1.2 GHz or greater recommended) with a 32 MB NVIDIA® GeForce2 MX® or better (NVIDIA® GeForce3® / ATi® Radeon™ 8500 or better recommended)

note how at the moment the definition of high-end system is not yet given

HOW MUCH SPACE WILL THIS BIG LUG OF A GAME TAKE UP???
At the moment it has been said that the game will be 3 CDs of highly compressed data. In other words around 3gigs