First impressions of the handling (without pushing it due to breakin), is a significant change in the turn in/understeer I feel with the 996tt. The 997tt feels lighter on the turn in and much more eager to enter a turn. At first I thought it would go directly to "tail happy", but that was not the case. It reminded me of the active suspension in my F360 more than the 996tt. The feeling is more like being on rails (as in a train)or tracks. I am impressed after this short time with what Porsche has done on this aspect of the handling. Again, not at the limit or pushing, just initial driving impressions.
The front still tends to bounce a bit through rougher corners, but not enough to destabilize during the turn. I need to drive it some more, but my early impressions are that the 997tt "appears" to have a softer suspension, but is controlled in such a way as to not give away lateral control in a turn. This will take a bit of experimenting and getting used to. I am more familiar with track machines (Lola, Swift, Riley & Scott, etc.) on the one hand and performance street cars (Porsche, Ferrari, etc.) on the other hand. My initial impression is that Porsche has created a more active suspension a la Ferrari that appears to move towards the middle ground while keeping street comfort.
I am old enough to lose my teeth if I hit a pothole while in Sport mode, so I must pay attention to these things.