Finally got to play. I discovered that if you make some virtual copies and apply different setting or presets, you can import them as layers in CS3. So on this one I did 3 different versions of a B/W imported in CS3 as layers and changed the blend modes on the layers. Did cheat a touch, did alittle masking.
This image illustrates perfectly the difference of the new ACR 4.5 presets.
Preset Camera raw 4.4:
and with Camera Landscape beta:
Much more vivid colors and the histogram looks much better.