Sauber is fighting van der Garde's bid to race in 2015.
Toro Rosso could not afford to wait for RBR to sign off on 2015 designs.
James Allison says not all expectations has been met.
#51 and #71 Ferrari drivers are confirmed.
The new V8 debuts at Geneva: track-level performance and responsiveness for the road.
Christian Horner says fans won't be disappointed with a new livery.