Wireless HDMI is a technology for serving wireless high definition video and audio in consumer electronics. This is a relatively new technology as you can tell by the low number of products available at this time. see this search for wireless HDMI.
However, Wireless HDMI is the perfect alternative to putting holes in your walls to run HDMI cables through. In fact, you can broadcast in full 1080p using most Wireless HDMI kits like the Brite-View BV-2500 seen above are designed to help make installs much easier when you can't stick components in the same room.
Future of Wireless HDMI:
Eventually all devices that accept HDMI cables now will have wireless HDMI technology built in. Currently it's just too expensive to use a feature that may not even be used by consumers.