Ten years in IT, I've been part of roughly 4 acquisitions across a few jobs. Each time the line delivered to the employees is more or less the same: "don't worry, we don't intend to change anything. It's business as usual".
Then a few months in, the warning signs begin. New HR documents to sign. New benefit schedules. Then there's some turbulence from above -- talks of upper management getting reshuffled. New org charts.
A few months after that, there's new customers to support, new SLA guidelines, new meetings for us to attend. _Then_ it's your organization that starts getting sacked.
It's all just a cynical dog whistling to get people to stay complacent and continue turning the cog while they pull the rug out from under you.
Thankfully I've become adept at the skill of jumping ship when I see the first leaks, if you know what I mean.