"Nothing is changing" -- when the company buying you says this you should be concerned because it only means their strategy is to keep you 100% in the dark about what will change rather than partially.
This means many employees won't be prepared for the changes, and many quit as the ground shifts beneath them over the next 5 years.
It also means leadership hasn't made a list of things that are worth fighting over vs which changes to accept, so they're not going to have a clear vision on how to defend the important parts of their culture.