Just spotted this bit of Info over at the TechReport.

AKIBA is reporting that ASRock's P4 Combo has been spotted on the streets of Japan. This hybrid motherboard is based on Intel's 848P chipset and features both Socket 478 and LG775 for easy upgrading in the future. Of course, the board was not designed to be capable of dual processor SMP. You can only use one socket at a time.