Eh people will be salty about the Salesforce name but honestly their acquisition of Heroku hasn't caused me any pains regarding our experience with that platform. I'm as skeptical as anyone else, and I think there's more risk in a tighter "integration" making it a miserable experience. Might be a good time in the market for a new Slack competitor!
Judging from Salesforce's past acquisitions I'd bet (and hope) that we won't see a lot of changes being forced on Slack users in the future. Salesforce will probably use it internally and include Salesforce product integrations, and likely start to use it instead of Chatter.
I don't believe Salesforce got much value out of Heroku however. Their main app isn't built on top of it, and they were shopping around for cloud providers to expand to places like Australia.
