A coworker of mine recently asked me if I had heard about any issues with R56's just dying out right. His R56 died while driving on the highway and could not be revived. Apparently, his service advisor told him that the problem was with the timing chain and that there is currently a recall on them. Luckily for him, they are replacing his entire engine.
I did a bit of research on NAM and apparently the timing chain has been a problematic item, mainly due to it making the car sound like a diesel with a cold engine. I do not own an R56, so can't personally comment, but thought it might be useful information to you new gen owners.