there is information on Russian news that Valtteri Bottas has agreed a deal of sponsorship and offers to pay to Williams 75% of the payment that Bruno pays at the moment (that would be around 10-12 mil euros)
It is a shame about Heikki. There are really way to many pay drivers these day, although some of them are actually not bad.
There are also rumours that other drivers might be negotiating for Grosjean's seat. I would be surprised if Boullier does let him go, but on the otherhand Lotus could have been 3rd in the WCC with a more constant point scorer.
Heikki Kovalainen confirmed Autosport interview than does not want to compete in the DTM series or sports cars, and he is not interested to act in the F1 test drive. Rally interested Kovalainen, but he admits that it is too difficult financial and competitive issues because of participate.