Re: HDMI?
Yes it will. An example is if you want to playback HD-DVD/BluRay, you will need a HDMI 1.3 (the latest version) AV Receiver to accept TrueHD+DTS-HD master. the problem is... HDMI 1.3 AVR aren't really out yet... especially at that price.
so, wait until next summer or fall and you'll begin to see HDMI 1.3 AVR's.
now, if that doesnt matter to you... then get AVR's that support 1080p (read the AVR spec, not HDMI). i think that's about it =).