I'll try and post some caps later today. I haven't had a chance to look at the show closely (my PC isn't up to simultaneously recording AND decoding AND de-interlacing H264 MBAFF 1080/50i stuff live unfortunately - H264 is a LOT more intensive in processor terms than MPEG2)
I wouldn't be surprised if the Steadicam is an upconvert from SD - as I expect a lot of the location VT and graphics to be. I suspect the Beeb will only be doing bits in HD initially that are relatively cost-neutral - i.e. they have an HD studio so run the studio in HD to provide more HD material for the HD trial.
After all SCD will be one of the first times the Beeb have originated HD without a co-production partner needing it or a host broadcaster providing it. Wimbledon was the other occasion I guess - though I think NHK may have taken the HD feeds?