Williams hire Jason Somerville and Mark Gillan to join Mike Coughlan in developing their 2012 car.
Jean Todt has said the 2012 F1 calendar will have 20 races instead of 21.
The Canadian government say Renault can keep their black-and-gold livery for this year.
The 2012 F1 calendar will contain a record 21 races as the United States Grand Prix is set to return.
Seats at Red Bull and Ferrari potentially up for grabs in 2011.