Being a huge fan of Steve Wilson and his work with Porcupine Three, Opeth, Katatonia, Blackfield, Paathos... I can only foresee benefit to OL if they work together.
I don't think Steve has changed dramatically the sound of Opeth, they just helped opeth lifting onto a different stage of composition and he did it very well not only because he's a great composer and producer but also because mikael's got an enormous talent