just looked at it real quick, but there will be some changes in the engine concerning lightning previewed at GDC. dunno if this can be usefull to you..
http://www.mcvuk.com/press-releases/45399/Epic-Games-to-Show-Major-Unreal-Engine-3-Upgrades-at-GDC-2009
http://www.mcvuk.com/press-releases/45399/Epic-Games-to-Show-Major-Unreal-Engine-3-Upgrades-at-GDC-2009