I'm testing build may 27 for 5d2 posted by a.d. -bfd891fe53ab.zip and here is my observation so far.
The delete feature is a nice feature but currently it is very risky. Use with caution.
scenario:
Shoot several clips raw video, say clip 1 2, 3.
Go to ML menu>raw video menu>video file (this shows NO VIDEO FILE as default)
Click SET to show first clip, M0000000.RAW,
Say you want to delete 3rd clip so you turn the main scroll wheel to go to M0000003.RAW
then you ROLL down to select DELETE then press SET to delete video size but file remains but 0kb in size. This is ok for now, also note WAV file remains unchanged and not deleted.
But here is the risk,
While selection in still in DELETE if you happen to roll the TOP SCROLL WHEEL, the clips be DELETED 1 by 1. ! THIS IS RISKY as you think you are selecting the clips but in fact they are already deleted without warning.