I know, I looked at the site in original. What I meant is if Prime 3.1 should be the attempt to repair Prime's damaged image.
I don't think Prime is at a point to repair its image. From what I've heard Prime 4.0 won't quite be there either.
I also could not image that P4 would live up to MC15, but then - why P 3.1 and not 3.0 M010 or P4?
One explanation would be what you just said. As P4 is as far as it should be they call it P3.1.
We will see in three to six months and I'm not excited.