Today I see on kicker.de that Wolfsburgs chairman Garcia Sanz and his deputy Grühsem yesterday went to Wolfsburgs training camp, as mentioned by oleole123. According to Kicker, Sanz made the the following statements to the press: "We are not selling any one", "The player must want to stay", "At the moment we are not worrying about that". Interestingly this is almost exactly the same wording as Allofs and Hecking have been using in the past. Make of it what you want. The conspiracy theory about a secret deal between Wolfsburg and Bayern München is hard to see there in my humble opinion. To me it rather sounds like De Bruyne can be sold provided he wants it himself, and provided the money is right. I'd say the poker game is ongoing.
For what its worth I think Perisic and De Bryune are completely independent of each other. I don't believe there is any causal connection between a sale of Perisic and a sale of De Bruyne.