Newest nightly, 600D, mlv_rec with mlv_snd is such a beautiful thing. Still limited to 9 secs of movie at 1280x536 but it now does 9 secs WITH SOUND. 22khz for the record. Still have to test the other sample rates but 22khz is completely fine. No more "dead" pixels, hot/cold pixels, whatever they're called.
Two issues I'm seeing, though. Acr 6.5 in AE CS 5.5 isn't recognizing the metadata of the dng's exported with the OSX Batch Convert App (recursive0.4.command, OSX Mavericks), it displays the camera model at the top of ACR but nothing under camera profiles and no wb info. And maybe I'm missing something because I haven't been following MLV development much lately, but the camera crashes (Err70) every time I try to record in 5x crop, in both 1080p and 640x480 mode. BUT, if I record in the 600d's 3x zoom mode it runs just fine.