Though not confirmed,!
Reports in the Brazilian press, are that Raikkonen has signed a one year deal with Mercedes after the Button deal was reported to be final.
Timesonline.co.uk as well as Brazilian publications originating from a TV telecast are suggesting the deal is done.
http://ferrarif1forum.com/2009/11/19/ra ... rcedes-f1/
I find it entirely plausible after Raikkonen's manager said that a deal with Mercedes was not out of the question, provided that they agreed to meet Raikkonens terms.