Less is more. Microsoft just doesn't seem to get that. This interface looks like a convoluted piece of crap that changes based on what I search on. No thanks.
I don't know. I quite like the background photos on the current Live.com. It's a welcome change from the boring white pages.
I do agree that the results interface looks cluttered. Granted, they are trying to present a lot of information, but they should find a way to simplify it. I suspect they'll change it up in time and after a real world launch.
But that's just a taste preference (though I agree with the sentiment; I personally don't like white backgrounds in general). Plus, all indications are that the images are just a haphazard marketing decision. Good design controls and deliberately influences user behavior patterns. This just tries to look pretty and not be google, disregarding any impact that might have on usability or functionality.