Micro HDMI keystone
HDMI cables are tough to pull in a wall because of the bulk of the connector. A micro HDMI keystone, with active cables would make pulling HDMI pretty easy. Also, this would be nice because the regular hdmi keystone (product 6852) is a tight fit, a smaller connector would be able to fit easier.
Could be micro HDMI on both sides, or only on the inside. You would also want to add micro hdmi to micro hdmi cables.