I got my Antminer U2 today also, no luck so far. I'm using Windows 7 Pro 32-bit. SiLab drivers installed. Windows sees the device in corect port. The miner has a steady Red LED but BFGMiner has No New Device Found. I can't find any info from Bitmain for these either. Well, except for pricing.
I've contacted both Bitmain and resellers about getting a sample so we can upgrade the driver. No responses yet. I'd heard these were compatible with the U1 but apparently not.