An eBay item appeared on Thursday claiming to be a Macintosh G4 Quicksilver 2002 Server Logic board. This auction has since been pulled at the request of Apple.
The auction included a picture of the motherboard which appeared to have 4 DDR RAM slots as well as a mysterious port - which is presumed to be 1394b (Firewire2).
Xlr8yourmac.com's webmaster, Mike Breeden, had word of the unit, but could provide no details expect hint that it is a sign of things to come.
This Appleinsider forum post provides the seller's response to where the motherboard came from:
This board was sent to a friend of mine and was issued as a test board. I have been notified by Apple and eBay that this board was never intended for sale and the auction was cancelled at Apple's request. I apologize to all that this turned out to be a problem.
To all that were interested, this board runs GREAT. The DDR memory really improves the performance. I hope I am able to offer similar boards in the near future.