I really hope IBM can keep their fingers out of Red Hat, if not, it does not matter how many promises they make, they will run it into the ground. If they actually manage to keep away, and let their cloud business grow without interference; they actually have a chance to grab a big piece of the cloud business.
You don't spend $34B to not interfere.
1. Absolutely, PWC got assimilated over time. However:
2. For the first 5 years, culture in my part of BCS was 90+% PWC culture. Perceptible (again, from bottoms-up perspective, I'm sure lots more was brewing in the background) changes started creeping around 2007-2010 mark.
3. Today, 17 years later, I would claim it's a hybrid mix. We are clearly not the same as we were during PWC private-ownership, partnership-structure - no public company can be; but we are still different culturally than rest of the IBM.
4. Perhaps most convincingly, I'd say 70-80% of people I knew in 2003 in my part of IBM, who were originally from PWC, stayed for ~15 years. When many of them moved on ~~2017, it was for a very specific and very different reason. A whole bunch still remain though, including much of the senior management / partner / executive structure (my direct peers and management are all still ex-PWC).
Again, FWIW - there will be a myriad experiences and stories in this complex picture, but that's been my experience.