The Quebec goaltender has a no-trade clause (he can give a list of ten teams he'd like to play for), but I imagine he'd be willing to waive it for a contender like the Oilers. Let's add, however, that the Oilers are hooked on the maximum required by the NHL (payroll), so the Hawks will have to keep some salary and/or the Oilers will have to be salary cap compliant.
In the deal, Ken Holland could certainly include Mikko Koskinen, who has a $4.5 million cap hit. The problem is, will he lift his partial no-trade clause for the Hawks? Not sure! Other than that and the 50% holdback on Fleury's salary, there is no quick fix.