First, decide if you want to burn the bridge and if doing something weird could be betraying the colleague that gave you the information.

Then, being somewhat creative I think you could craft a fake resingment letter and show it to key workers but don’t sign it. Let them spill the beans. Depending on your contract it could mean big savings for the employer and it could mess up their strategy.

In any case, make sure to resolve any pending issues and get ready for the news.