Volvo will soon release the info about the new S80 which will be presented to the public on the Geneva motorshow and be launched in June, but I'll post some previews already:
Following engines will be available:
315 hp (440 Nm) V8 with AWD
new 235 hp (300 Nm) 3.2 6L
200 hp (315 Nm) 2.5 T5
163 hp or 185 hp (400 Nm) D5
later there prolly also will be two turbo-ed versions of the new 3.2 6L available (285 hp / 400 Nm and 350 hp / 450 Nm), both standard with AWD.
Some of the new features for this car:
Personal Car Communicator
Collision warning and brake support
4C chassis (but that was already available in the facelifted current S80)
New Volvo S80
Threaded Mode