With respect to the manager's not knowing, if they are an EB and they have someone being impacted, they absolutely know. I am a manager in Power who is voluntarily retiring, but otherwise would have survived this initial reduction, so I have some insight in to this. What the manager does not know for sure is their own fate. A manager not involved in the planning with Russel Stokes down in Atlanta, which started weeks ago, can already guess, but they all know that in the future, if you don't have seven or more reports or are an extra layer, you will either be moved or lose your job. Quite simply, they are looking at getting the most work done for the least amount of money.
I have been out of the loop, but getting information from an EB who is staying, so I know some senior leaders won't be there. That said, the math tells you most of the people getting impacted are SPBs who either have few people reporting to them single contributors where someone else could do their job with a bias toward keeping the less expensive and often times younger employee.
I don't know the date, but the voluntary retirement is November 30th, a Thursday and the managers are busy that day, so my bet is the 30th or Friday, the 1st. The plan all along was for a consolidation afterward, and then more reductions in Q1 and beyond per Flannery's own words.
In Greenville, in GTTC, if you see plain clothes and extra security you know you're within days of this occurring. The package will be one week for each year of service, which Ge doesn't have to do, but in France and Switzerland, you get a much better deal, even if GE pays fines as it's mandated by law (18 months in France).
Best of luck to everyone. If you can move, there are plenty of jobs.