Jolyon Palmer will switch to the DAMS team for a shot at the 2014 GP2 title.
Daniel Abt will move from ART to Hilmer for the 2014 GP2 season.
McLaren Formula 1 junior driver Stoffel Vandoorne dominated the final day of GP2 Series post-season testing.
Formula Renault 3.5 champion Kevin Magnussen has withdrawn from this week's Abu Dhabi GP2 test.
Ferrari Formula 1 protege Raffaele Marciello will test for front-running GP2 team Racing Engineering at Yas Marina this week.
Tom Dillmann has confirmed he will not start Sunday's final round of the GP2 Series after his first-lap crash in Saturday's feature race.
James Calado's 2013 GP2 title hopes are over after he was hit with a five-place grid penalty for Saturday's Abu Dhabi race.
Fabio Leimer set the pace in Friday morning's free practice for the GP2 Series finale in Abu Dhabi.
Kevin Magnussen will join his title rival and fellow McLaren junior Stoffel Vandoorne at this week's Abu Dhabi GP2 test.
James Calado won the 2013 GP2 Series season finale in Abu Dhabi on Sunday to seal third place in the drivers' championship.
Fabio Leimer sealed the 2013 GP2 Series title in the Abu Dhabi feature race, as Alexander Rossi took victory.
Marcus Ericsson has been stripped of his Abu Dhabi GP2 pole position after stewards ruled that he exceeded track limits on his best qualifying lap.
GP2 championship leader Fabio Leimer says he has no reason to feel nervous heading into this weekend's title decider.
Simon Trummer will stay with Rapax for a third GP2 campaign in 2014.
Thirteen teams will compete in GP2's fourth three-year cycle, running from 2014 to 2016.
Campos will return to the GP2 Series from 2014 in place of Addax, the championship has announced.