Well, if this is true then I'll be glad to see Dowling go. I'm probably biased, but I don't think he's impartial enough for the host role, and some of his comments during BB12 especially were bang out of order.
Hosting might be a good move for Emma too: she's always been a huge BB fan, and she's seemed uncomfortable effectively having to be the official mouthpiece of Endemol from time to time on BOTS - especially during the Connor fiasco last year.
My one concern is what happens to Jamie East. My feeling about Jamie is that he's constantly trying to have it both ways: he came from Holy Moly as a sort of "voice of the fan", but then rather became poacher-turned-gamekeeper, as his Endemol-defending spat with Aaron illustrated. Will be interesting to see where he goes next...