I'm getting this strange feeling that neither Beyonce nor Winehouse will end up doing the theme...
Why 'strange' feeling?
In the past the actual artist wasn't mentioned by the tabloids before the official press release.
So it would be a big surprise if any of the yellow press-artists (Winehouse, Beyonce, Adele, Vile Valo, Leona Lewis etc.) will get the job.
Remember: there were hundreds of rumours in 2005 and 2006. But Chris Cornell wasn't one of them, until the week he was officially announced. It's the same thing with every new Bond film.