There has been some major news on this.
Carlos Munoz is reportedly set for a full time ride with Andretti. He doesn't have a major sponsor behind him (aside from a few associates) but it is reported by Open Wheel America and Champ Car Uncensored that he will be full time
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Jack Hawksworth is expected to be at least part time with a Honda team.
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Ryan Briscoe is the leading candidate to drive the #4
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Ganassi's third car (#38) may be returning
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Rahal Letterman is seeking to enter the #17 (which had Mike Conway at Long Beach and Michel Jourdain at Indianapolis) for more races, possibly for a full time campaign.
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The schedule is expected to not add any new races except an Indianapolis Road Course race before the 500, but a number of events remain possible. These include: A round in Italy at either Imola, Mugello, or Monza; a return to Cleveland; a new race at Ft. Lauderdale; a new race in Providence Rhode Island; A round at the NOLA track in Louisiana; a return to Road America; Michigan; Phoenix.
So the team situation looks something like this.
Team Penske = 2 - AJ Allmendinger?
Team Penske = 3 - Helio Castroneves
Team Penske = 12 - Will Power
Panther Racing = 4 - Ryan Briscoe
Panther Racing = 60 - Townsend Bell
Panther/Dreyer & Reinbold Racing = 22 - Oriol Servia
HVM/Andretti Autosport = 5 - EJ Viso
Dragon Racing = 6 - Sebastian Saavedra
Dragon Racing = 7 - Sebastien Bourdais
Ganassi Racing w/ Felix Stabatas = 9 - Scott Dixon
Ganassi Racing w/ Felix Stabatas = 10 - Dario Franchitti
Ganassi Racing w/ Felix Stabatas = 38 - ??????
Ganassi Racing w/ Felix Stabatas = 83 - Charlie Kimball
KV Racing Technology w/ SH = 11 - Tony Kanaan
KV Racing Technology = 78 - Simona de Silvestro
Foyt = 14 - Takuma Sato
Foyt = 41 - Chase Austin or Conor Daly
Rahal Letterman Lanigan Racing = 15 - Graham Rahal
Rahal Letterman Lanigan Racing = 16 - James Jakes
Rahal Letterman Lanigan Racing = 17 - Mike Conway?/Michel Jourdain?
Dale Coyne Racing = 18 - ???
Dale Coyne Racing = 19 - Justin Wilson?
Ed Carpenter Racing = 20 - Ed Carpenter
Andretti Autosport = 25 - Marco Andretti
Andretti Autosport = 26 - Carlos Munoz
Andretti Autosport = 27 - James Hinchcliffe?
Andretti Autosport = 28 - Ryan Hunter Reay
Andretti Autosport = 29 - Kurt Busch
Schmitt Hamilton Peterson Motorsports = 55 - Tristan Vauliter
Schmitt Hamilton Peterson Motorsports = 77 - Simon Pagenaud
Schmitt Hamilton Peterson Motorsports = 99 - Jack Hawksworth?
Sarah Fisher Hartman Racing = 67 - Josef Newgarden
Sarah Fisher Hartman Racing = 97 - Lucas Luhr
Herta/Agajanian Autosport = 89 - J.R. Hildebrand
Herta/Agajanian Autosport = 98 - Luca Fillippi
Blue = Part Time