There are notable exceptions. Heroku is still shipping awesome new stuff at a rapid clip under their Salesforce overlords. I don't know directly, but the plan at acquisition time was that they would stay pretty independent. I would guess that that helps a lot.

I think Pivotal could be one of those. Him saying "same services" suggests that EMC isn't planning on absorbing the team into something else. It helps that Pivotal is (presumably) very profitable, so there's value to leaving it alone instead of just viewing it as a source of a ton of great devs.

If it's still really Pivotal, and it just happens to be owned by EMC, they might fade much slower than the "everyone leaves within a year and a half" that we've seen so many times.