Looks like the beta of Bing was switched on in the early hours not had chance have a major look around yet – will report back when I have a little more time.
A few things that caught my eye were guided search assistance on the left and the different experiences for the images, videos, shopping, news and maps.
They even have a Twitter account 🙂
Dennis Schaal has a little review on Bing’s Travel functionality – as said above will try and play a little more later