Nothing..
The teams name hasnt been changed since last season due to a lot of mix-up with the team and they did not have time to apply for a change of name well enough before the season started..
Peter Sauber now owns the team entirely and has plans to rename the team during the season.. we'll see wat happens..
This link shud give u a clear picture of the teams recent and past history..
http://en.wikipedia.org/wiki/Sauber