Just keep in perspective that CPU performance improvements will be modest at best for 2012. About a 10% average.
Video performance improvements are moot since iMac uses external video interfaces.
I'm just holding out for USB 3.0 for the +4gb transfer rate.
USB 3.0 External HD are a lot cheaper than Thunderbolt.
May be they will add an eSata port too.
http://news.softpedia.com/newsImage/Intel-s-Official-Ivy-Bridge-Benchmark-Slides-Leaked-4.jpg/
Video performance improvements are moot since iMac uses external video interfaces.
I'm just holding out for USB 3.0 for the +4gb transfer rate.
USB 3.0 External HD are a lot cheaper than Thunderbolt.
May be they will add an eSata port too.

http://news.softpedia.com/newsImage/Intel-s-Official-Ivy-Bridge-Benchmark-Slides-Leaked-4.jpg/