This is what salesforce plans to do with Slack:

all integrated into one

1. CRM
2. Marketing
3. Project managing
4. Knowledge base

All hooked into the shared protocol of email and polished with Slack chat functionality

So Salesforce next move is to potentially buy out one additional company for the email aspect to increasingly making it difficult for customers to leave, similar to what Microsoft does. The only reason Microsoft gave Teams out for free is because it wanted to crush Slack from competition.

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I believe they will have Slacks interface but with a Personal inbox, Teams inbox and then Apps all bundled into one. I'm assuming they will re-design Slack into threads, where users can tag in colleagues and start a mini-chat instance that runs parallel to the conversation in the email exchange. The idea is to permit quick discussions of questions and clarifications to occur where they have the most context.

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This would almost be a war against Zendesk and Intercom, Microsoft and google.