Ganassi: Four car team with Dixon, Franchitti, Kimball and Kanaan.
Penske: Three cars with Castroneves, Power and Montoya.
Andretti: Andretti and Hunter-Reay will stay, also Hinchcliffe and Viso could stay. Hinchcliffe also in rumoured to go to KV, Viso could also open a new team with Venezuelan money and the support of HVM. Munoz could also climb up from Indy Lights, so it could be a five-car-team, also three or four are more likely.
Schmidt Peterson Hamilton: Pagenaud und Vautier will stay.
KV: I think De Silvestro is safe, second car perhaps with Hinchcliffe or Bourdais
Dale Coyne: One car for sure (likely Wilson will stay), perhaps a second one with different drivers like Conway.
Foyt: likely one car for Sato, perhaps another one for Daly?
Dragon: Perhaps just one car for Saavedra or Bourdais, perhaps both are staying. Not ruled out that Briscoe will drive for them.
Rahal Letterman Lanigan: Rahal will stay, why not Jakes will too?
Fisher Hartman: The team will expand to two cars, perhaps with Lucas Luhr alongside Newgarden. Luhr with the support of Greg Picket.
Panther: Servia or Briscoe could drive.
Herta: Wants to expand to two cars. Likely with Filippi and Hildebrand.
Carpenter: Carpenter will stay with one car for himself.
So I guess
Ganassi: Dixon, Franchitti, Kimball, Kanaan
Penske: Castroneves, Power, Montoya
Andretti: Andretti, Hunter-Reay, Viso and Munoz
Schmidt Hamilton Peterson: Pagenaud, Vautier
KV: De Silvestro, Hinchcliffe
Dale Coyne: Wilson, Conway
Foyt: Sato, Daly
Dragon: Bourdais, Saavedra
Rahal Letterman Lanigan: Rahal, Jakes
Fisher Hartman: Newgarden, Luhr
Herta: Filippi, Hildebrand