It seems so right now... watching a ISS HDV stream right now on NASA TV. But currently it's experimental and it's not decoding perfectly missing I-frames during decoding. I think the data's fine though cause although it's not decoding certain I-frames, it's not dropping out.

...And they're still streaming it on this mission (STS-122). Looks like this will become regular. But those frame breaks... hard to watch when there is high motion.