The planners at AC will "release" the schedule for distribution on a Monday afternoon. From that point it goes to OAG and other CRS systems on Tuesday and AC starts to input it into their RES-3 system [manually].

It depends on where ITN/Expedia/Sabre pick the schedule from as to when you "see" it. For the October schedule, it should be there by Thursday, but for the November and beyond I would expect it to be another week perhaps.

At any rate an announcement would be made on a late Monday or an early Tuesday of any week.