Let the hive mind of Engadget get that for you.
"What is the best wireless surround sound speaker solution? I have a home theater where running wires is just not feasible. I have my own speakers, so I don't want a system that has speakers with integrated wireless. I've done a far amount of research and have only come across a few companies that even offer a reasonable solution: KEF, Kenwood and Rocketfish. Is there anything else out there? What do you recommend? Thank you!"
Or, they could use Switched Digital Video to save bandwidth on the digital tiers, which is what they're doing.
The article says "they have to support CableCARDs and the hardware for OCAP". You're somewhat right, CableCARD is an FCC requirement but OCAP is not required by law.