Mercedes will have to find a new 3rd driver as Nick Heidfeld will leave to become Pirrelli's permanent tyre tester later this month. http://www.motorsport.com/news/article.asp?ID=381888 With Mercedes wanting to keep an all German team, this pretty much guarantees that Schumacher will still be at Mercedes in 2011 with Heidfeld being the only competition for next years seat.