Look forward to a hard choice that you (as a person) and you (as a team) will have to make.
Ex-CA Technologies employee here, engineering ICB (you will learn soon enough that ICB means, basically, "not a manager" :), giving you a gist of pluses and minuses:
That big plus: $. To expand: in three years I've earned enough dough to purchase a really decent apartment in my place of residence (not that I bought it, I prefer to rent). The dividends I'm getting every 3 months are already enough to pay for my rent (so I, basically, have zero accommodation costs). No base salary increases for two years (and the one in the first year was ~2%), but can't complain, at the end of the month I'm always left with ~1k USD that goes straight into my investment p-t.
That big minus: zero touchy feely "cultural-y" "personal development-y" "work hard play hard-y" "team brunches" "team buildings" fluff. You are bought (see the plus section above). No Google-like "personal projects", no tech certifications, no new ideas, features or tech stack, unless there is a customer willing to pay a garbage truck full of money for it (which does not happen often). "Our culture" dictates you have to work from your office every day, don't even dare utter the word "hybrid" in here. See the rest of the details in the other answers (which are perfectly correct btw).
You will have to make this informed choice: stay, or leave?
If "stay", kiss whatever bottom you can to get a last minute promotion (it will maximize your earnings and you will not get another for a long time), grab whatever swag, gear, stuff you can legally get before the acquisition (no branded flannel hoodies for you afterwards, believe you me), and batten down the hatches. Enjoy your Benjamins and that warm, giddy feeling that, at long last, you found a buyer for your soul.
If "leave", stop reading this post now and start updating your CV. You may postpone starting to apply to new positions until tomorrow morning.
P.S: This doesn't apply if you are HR, Legal, Payroll, Support etc. If this is the case, the choice has already been made for you, see the "leave" option above.