Reply to Rob from Bob: The differences between v1.2 and v1.3 HDMI enable future devices to perform at higher levels. v1.3 is a framework into which hardware and software designers can create new higher performance content and products. Its much more about whats next than about whats out now.
Here is a link that may help: Top 5 Things You Need To Know About 1080p And HDMI
Note, HDMI v1.2 can do everything you need it to do now. v1.1 too. There is no reason to not purchase anything available today. You can learn more by going to HDMI