Not really. From what I could understand, we're talking about a bunch of silly hypothesis from a couple of Italian newspapers.
1. The newspaper "Il Sussidiario" mentions that Juve are interested in bringing Dzeko as "top player" because Zlatan's wages will be a problem.
2. The newspaper "Libero" says that Ferguson is an admirer of Vucinic and Manchester
United would be willing to buy him from Juve.
Then Football Italia merged the two stories and came to the conclusion: "Juve will sell Vucinic to United in order to bring Dzeko from City". Then some sites and fans (like you Hydde) misunderstood the FI story and started talking about a Vucinic-Dzeko exchange