I don't expect it will be One Big Patch. I expect it will be a few biggish ones, in 2-4 month intervals and then beta. I hope S2 final will have (things that we know will be done are marked):
AI improvements, including pitstops (certain)
False starts (certain)
Improved clutch simulation (certain)
Interiors (certain)
Track improvements (certain)
Multiplayer features (certain)
More than 20 racer grids
Improved drivetrain simulation, including differentials and engine as well as support for better sounds
Torsen diffs
Chassis flex, jacking forces
Improved aerodynamics, including better undertray simulation and ground effect
A few more tweaks on the tyres (certain)
Independent suspension settings
More setup options for race cars
That's a pretty tall order.

If that was one big patch... then expect it somewhere around November.
