The coffee case has been one of the most misrepresented cases of all time. It was much less about the lady spilling and much more about the culpability of companies who ignore safety complaints.
If it had been the first time that Mc D's had served coffee that hot and someone had been injured, she would have gotten zilch. However, there was a well documented trail of safety complaints and even communication within McD's about the issue that was never addressed. Basically, her lawyer lucked into a situation where he had provable, documented, and systematic negligence on their part. Not something that happens very often.
With relation to this case, I don't see it going very far. Unless BMW has been covering up multiple reports of raging unending boners since the bike came out, they have zero liability, especially since he changed the seat.