Jan.16 (GMM) F1 team Red Bull Racing launched its new single seater for 2008 at Jerez on Wednesday.

In a low-key presentation outside the Spanish circuit's pits, in very light drizzle, the Milton Keynes based squad showed off the evolutionary RB4 and confirmed that Swiss teenager Sebastien Buemi will be the official test and reserve driver this season.

Buemi, who replaces Germany's Michael Ammermuller, will also race in the GP2 category this year, and joins racers Mark Webber and David Coulthard in Red Bull's F1 lineup for 2008.