It is hopeful spring of 2014 but if it takes more time they seem committed to take more time (as long as they have money - no clue how presales (on steam) have gone or how much money they currently have). My personal guess is they will skip some features and try really hard for Spring 2014 and then add the missed features as a patch but hopefully they will provide an official suggestion to this thread as to current plans and current condition of game relative to final release.