I'm loving the Bing Maps Preview. The tilt gesture (slide two fingers) is especially brilliant, and, better still, I've discovered it can also be used in conjunction with the rotate gesture.
However the Preview currently lacks Bird's Eye view. Please implement this feature because it makes a significant difference to one's experience of tilted maps. (I imagine it'll be more of a challenge to implement now that several degrees of tilt are offered rather than just one as with the web app, but hey, what's a technical challenge if not invigorating?)