Here's the first manufacturer to back the new os with it's hardware:

Press release:
Keep Leading: ASRock First To Pass Windows® 8 Motherboard Certification
TAIPEI, TAIWAN, June 11, 2012 – Global Top3 motherboard player, ASRock Inc., today excited to announce that it is the first motherboard manufacturer passed Windows® 8 hardware certification in the world. With the outstanding R&D capability, ASRock motherboard is hardware ready to support the newest operation system Windows® 8, delivering a safest and most convenient computing environment to their users.

Press release:
Keep Leading: ASRock First To Pass Windows® 8 Motherboard Certification