Not in the know at all, but I do believe what we are seeing at the moment is very early days in the move to integrate Skype to the OS and then other systems into it as well, for example in the messaging app on the phone you can see Skype IM's and standard texts, but on PC's tablets you only see the Skype IM's, I believe they intend to have the texting messages show up and for you to be able to text from your PC.
As an example if someone now calls your phone and you miss the call, Cortana can let you know on your PC and you can then text them back from your PC, at the moment this is Cortana and missed calls only but it shows what can be done.
The potential is very interesting, but for now we are still in the early stages.
However I still think there is room for a proper universal Skype app, based on the already working and developed WP and Xbox One versions for users who want to use Skype on tablets because the desktop version just doesn't work on a 7 inch tablet let alone much cop on a Surface Pro 3 in tablet mode.