okok, after getting frustrated with the left for dead 2 SDK, i just downloaded the CryENGINE 3 SDK. tried the example file "forrest.cry" - I'm completely blown away.. u can switch back and forth between game- and the editor-mode in real time. lightning is displayed in real time. water is moving, there are even rain drops. and sound. and u can modify, move around, change lighning (basically mapping) in real time! wtf!? how is this even possible, i don't even..
game design changed a bit since i last tried it with the quake 3 map editor.. the possibilities for arch viz are also there. it displays a HUGE area (maybe 500x500 meters) of high poly forrest with 30 fps.
haven't tested exporting from SU yet.

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