Nikon introduced the D300s today. It doesn't seem to be a killer cam in terms of video but it offers some good things while filming.
+ Hopefully full manual exposure control (or is it just possible to set Arperture?)
+ External mic input
+ Four selectable mic sensitivity levels
+ Contrast detect AF in tripod mode
+ M-JPEG codec
+ Probably 4:2:2 color compression
- Same low data rate as the D90
- Probably the same aliasing problems and stairsteps. We'll see.
