Any chance there will be an iMac upgrade announced at Macworld? I assume the Pro will see this chip first - just wondering if there are any rumors. I am looking at getting the 20 in. 2.4GHz before Christmas, but there could very likely be a speed bump at MW. Maybe even a jump to the 2.8GHZ in the 20in. I'm thinkin' - why not just wait 2 extra weeks. What do y'all think?