Lower light is because they improved the manufacturing process. Same chips, better production process, which reduces noise and increases sensitivity a bit on the chips.
Placed some new controls on it - more iris settings (exposure control), zoom and record buttons on the handle, changed the feel a little.
Not really a new camera, just an improved version of the old one. But the old one still wasn't lacking in the performance department before the update.
As for 24P...if you really want that stuff, buy a REAL camera...if you want to second mortgage your house. Personally, I'm going to be shooting for TV based video, so the smoother movement due to interlaced video (what it was designed for) works for me.