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!"
HD DVD had combo disks.
Like I said, it can be modified to be compelling like DVD was over VHS (in which case, backwards compatibility wouldn't be so important), but as it stands now: nope. I'm going to hold off and see how downloads work out.