Panasonic Announces MPEG-4 Support in P2

[toke lahti]

But in terms of real differences, the fact that the data rate is HALVED - for comparable quality - should be considered very significant in practical terms...

This is exactly what I have hard time to believe. Where does this encoding efficiency come from?
AFAIK, Avc-I-frame-only has only one major advantage compared to dv/mp2-I-frame-only, which is adaptive macroblock sizes. And Panny was talking about 10bit colors...