I imagine I will be at final release at the end of the year, although thats very variable.
The current build has a LOT of stuff in, but its lacking marketing, some further complexity in the economics model, defect & quality stuff, mod support, cross platform support & non-english languages. We also only have placeholder sound effects. There are some future techs still to go in such as hybrid/electric engines, diesel vs petrol, catalytic convertors and a bunch of engine related tech stuff. We will probably make the tech tree quite a a bit bigger (its already big :D)
Research is a big part of the game. its currently divided between process-related (factory) research, and tech research such as GPS, Anti-lock brakes, heated seats etc.
Staff are less of a concern, although I do plan eventually to support upgrading staff to be robots. Currently each production slot has 2 robots, and you can research upgrades to 4, 6 or 8 robots. Better robot quality/speed and reliability will come eventually, as will robot breakdowns and maintenance.
The economic model is relatively basic at the moment. The sale price depends partly on your output volume, and partly on the novelty of your tech vs the established AI competitors. A more complex economic model which has different market for bidy styles (ie compact vs sedan vs SUV...) is in planning.