From eurosport.com :

BMW's new F1 team have warned against unrealistic expectations as they prepare for their grand prix debut in Bahrain next week. Team principal Mario Theissen said the F1.06 car was expected to be significantly better than last year's Sauber, the team they took over, but did not expect miracles.

Well, I am sure they are going to win races, unlike the late Sauber team. I really liked Sauber but it was kinda pathetic to drive over 100 GP's and never win

Good luck, BMW !