If you feel you are ready for the D conversation, then I think you should do it. I think if you are dating and it feels right (emphasis on the "it feels right") then a part of you already feels like you are no longer married.
However, and this is how I feel about dating too, if in anyway, it doesn't feel right, but you are doing it because you think you 'should' be dating, or because it is a two fingers up to your W (which I don't think it is in your case), then I would do as Ovrr says and just let it happen if and when it happens.
Good luck. I think no matter how emotionally prepared we are for the divorce talk or any R talk, it and they still sting like a MF.
