Earlier this month, Fourtitude speculated on Audi's returning to a bi-turbo V6 setup to the next S4. Now, AudiWorld says they've confirmed with unnamed insiders the next S4 will debut with a new 3.0-liter TFSI twin-turbo producing 330 horsepower. Despite a 10-horsepower drop, they say zero-to-60 times will fall from the current model's 5.4 seconds into the low five-second range, all with a fuel-economy gain from 17 mpg to over 20 mpg. And aside from besting the BMW 335i, the return to the turbo six means tuners will have a wider range of options for making even more horsepower. The new, B8-platform model will also get Audi's new vectoring quattro-drive system, which will allow on-the-fly torque allocation to all four wheels. No word on price, but expect an auspicious, champagne-soaked debut at the New York Auto Show in April '08. [AudiWorld]