Today I read an article about Daimler leaving F1. It's only speculation but it is about Daimlers articles of corporation that forbid Daimler "tolerating unethical or corrupt practices by employees or by business partners".
As we all heard before the Daimler board (or at least Daimlers shareholders) tried to stop Daimlers F1 commitment.
That (in combination with the fact that Daimler is under surveillance by the SEC - because of an corruption scandal in 2010) might be their chance "to pull the plug".
This might be pure speculation (as the source is motorsport-total) but the fact that Mercedes hasn't signed the concorde-agreement could be part of the whole game. (Either to put Bernie under pressure or to leave F1)
Here is the article:
[German]
http://www.motorsport-total.com/f1/news ... 62609.html
[English Google-Translation]
http://translate.google.com/translate?h ... CCQQ7gEwAA
And here is an Article about Mr. Gribkowsky on autosport:
http://www.autosport.com/news/report.php/id/100527