I expressed this to one of the Microsoft marketing managers named James. I explained that it was the one feature I had on Android that I liked and helped me give up a physical keyboard. He said he would pass the word along, and based on our conversation, I believe he will.
Now based on the SDK leak in July, I think it's going to be technically possible to develop Swype for WP8 going forward, but it's just a question of whether Swype will take the time and interest or not. It would be an attractor for Android users for sure.