By all accounts I've heard/read and just looking at the engineering of the system, it should be a totally different ballgame over the older Haldex systems.
It is not a permanent AWD system like Symmetric or quattro, but it is probably the most advanced and dynamically capable non-permanent system to date.
My guess is, that if you don't like the dynamics as much in the snow or dirt, the system will be modifiable, just like the Haldex of previous gens. My cousin has a World Challenge S60R with a modified Haldex (40% front, 60% rear, permanent) and it's not at all like a standard Haldex S60R.
VW guys have been hacking Haldex since the late 90's.
I can't wait to give it a spin...I really see this as a affordable S4 competitor (or 335xi), not really a rally car (3700 pounds? oooof). The 9-1 size car would be better for that.