This has been going on got 10+ years– same story "more information to come". That never has happened. Nobody ever knows - even your Manager doesn't know until the last possible moment. Then it's a forbidden topic - you're told not to discuss it with other, or you might 'impact morale' on the rest of the team/dept.
Other companies don't operate like this. Weak leadership at the top, nobody's home in HR, and your Mgmt chain is afraid of making waves and sticking out, lest they be selected next.
Pathetic all the way around.