In reading the posts you referenced, the replies, and the posts which the ones you referenced replied to - I am struck by the fact (actually my understanding/interpretation) that the patent expiration date is not certain. (May '14 vs Sept '15)
I draw that conclusion possibly because I don't fully understand everything I've read (and I don't know the court cases), but also possibly because I didn't see a source cited that said essentially "May 2014 is it!" The posts make reference to some expiring in May '14, and others (or is it just one other?) expiring in Sept '15.
What I'm asking is this: is the expiration date a verifiable fact, or a supposition?