Great info.
Oh the biggest reason for the N20 to need to hit 240hp is, of course, to be able to replace the 240hp NA I6 in the U.S. 528i without it looking like a downgrade to most buyers, who are only going to look at the horsepower number. If somebody notices that it's a 4-cylinder now instead of a 6-cyl and has a bad reaction, the sales people can instantly jump to the "so? it has 30 lb-ft more torque!" line.
Was hoping we'd get something like a 520d for the U.S., but doesn't look like that's gonna happen.