It may go up in the short term as they take the safe route, but in the long term they'll devalue their high end.
Sure, anything new has question marks. But in the end it's all about adoption and how well Nokia can push it. At the very least, they don't have the forward looking statement that Android vendors have to deal with.
Again, if Nokia releases an Android device it will cannibalize any future non-Android path. They can't go that way and still maintain any sort of independence from Google without a lot more effort.