If you look at the FI V8's and the upcoming I6 this turbo'ed 4 will be a blast to drive.
Tons of torque and little weight.. Probably taking over the CFRP genes of the bigger family member M3/4. My guess would be north or similar to 350ps, as the optional M perf. Kit for the 435i/335i is allready at that level.
5xx Nm sounds pretty awesome and manageable