You'll be pleased to know Epic and UDK community that UDK Feb 2012 build is working like a dream in Windows 8 on a fairly moderate PC..
1 gig ATI graphics
5 gig ram
Quad core phenom chip
64 bit OS Windows 8
I'm sure you guys at Epic already know this but I just thought I'd let you know that I'm testing it out myself and will post any errors or bug issues here !
Anyone else with similar issues regarding UDK and Windows 8 I urge to post your feedback here too