You may change your mind with some of the new cars that will be out.
I very seriously doubt it. I have read about almost everything that is coming out. I am definately performance oriented. The only vehicles that could even give BMW a run for the money (performance wise):
Audi S4. A4
Cadillac CTS-V & XLR
Infinity G35
MB S class
If you read all the reports every magazine gripes about the interiors (except the Audi). They say MB is getting cheap. Automobile Mag gave the new 5 an excellent review. I think the only manufacturer that is stepping up is Audi.
The older TL had 260HP V6 and it did 0-60 in 7.8 sec. It wouldn't even strike fear in my 528i. I doubt another 10hp will do much. Just go drive an Acura - first it's front wheel drive. Second, take a closer look at the materials and the feel of the car. Open and close the doors, trunk and hood. Then go do the same thing on a BMW. Although I haven't gone to look at the new TL, I doubt it will be much different from the old.