I don't think it will replace the Focus, because it's too small, they could never get every thing of a WRC into it. Peugeot is thinking about using the 307 after next year because the 206 is too small and they have a lot of trouble with the weight balance.
When they wanted to enter the 206, they also had to make it longer (the bumpers are way bigger than the standard ones) and I think the Fiesta is even smaller than the 206.
It's quite obvious that it will be their next Super 1600, because the Puma has too much problems and has become too slow to keep up with the rest of the S1600. It has a 1.6 engine develloping 200 bhp and is FWD, if that is another key.