I'm hoping to see more home theater automation built in, now that HDMI seems to be helping to create a common interconnect that firewire failed to do. MHL has a newer control protocol built in with cross manufacturer support, and HDMI 1.3a also has a pretty extensive lists of cross manufacturer commands.

A friend of mine picked up a new Sony TV recently, and added it to his older Sony receiver. If you grab a PS3 controller and turn on the Playstation, the TV and receiver also come on, and switch to the appropriate inputs.