I think the more interesting point here is that nowhere is this thing labelled "Skype"...
It says something for how much MS has destroyed the (one time, many years ago, very positive) brand image of Skype that they're trying to build this on a completely different foundation.
So, basically, don't worry about Apple killing it. What you SHOULD be worried about is the Skype team within MS killing it...
(Or the same genius MS management that so thoroughly fscked up Skype deciding to bring their UI insights to this product...)