Company takeovers, what now?

So I'm not going into specifics but I do want to ask, did your company or the company your working for get purchased by an investment company and did you have a long forefilling career after that event, did anything change?

I'm trying to workout if I should be planning for Armageddon or an amazing time to come. I love where I work and I don't want it to change

Let me know your experiences in the comments!