I am sure its not true, but usually the employees are the last to find out stuff like that. They just come in one and day and crap a new owner.
I was working for a guy that was the Vice president of a private fortune 100 company, I can't remember the name for the life of me. He was at the top, came in one day and a guy was sitting in his office, his replacement. The company was bought out the day before and no one new about it.
The thing about private companies is that things can happen very quietly and quickly as there is no board to have to vote, etc. The current owners do not want to upset employees and lose people on rumors of being sold.
I doubt a person on some forum somewhere would know anything about Festool being sold.