They have shown the B3 sedan at the Tokyo Auto Show with a quoted 0-62 (100kph) of 3.8 and top speed of 188mph, I guess you knock off .1 or .2 for the US 0-60 run.
Alpina re-engineered the M340i's turbocharged, 3.0-liter straight-six to squeeze out 462 horsepower and 516 pound-feet of torque. It spins the four wheels via an eight-speed automatic transmission manufactured by ZF and tweaked in-house for quicker shifts, and BMW's xDrive all-wheel drive system.
Not coming to the U.S., however.