Heikki is back as reserve driver for Caterham this weekend driving in FP1.

Heikki Kovalainen is to return to Formula 1 action at the Bahrain Grand Prix in a testing role for Caterham.
Heikki Kovalainen rejoins Caterham as reserve driver - F1 news - AUTOSPORT.com

Nice to see him back and makes you wonder if he'll be offered a race seat by mid season? Seems mad to me having two rookies struggling when they have a guy with experience watching from the wings.