I sure hope so. I also hope that single cpu processors will still be common in the next couple of years. I would love to be able to upgrade my 1.6ghz G5 Power Mac once before I finally have to switch over to Intel with my next box. I doubt it will be anything special though.
I remember reading about one guy who bought G5 parts off of eBay and built his own. He used a motherboard from a 1.6 gHz G5 and placed a 1.8 gHz processor in it. Because of the different bus speeds between the mb and processor, the system clocked its self back to like 1.3 gHz.