I don't think anything changed really. I think Dimon talked negatively about Bitcoin while secretly working on a project that incorporates Bitcoin. I'm pretty sure all banks see the potential in blockchain. They are just waiting on the "right" time to publicly be involved. They have incredibly smart financial analysts, so they would be stupid to not be involved in the crypto world in some way. They are either waiting for the right time or they will make the right time.
RE: You can't make this stuff up: JPMorgan considering getting into Bitcoin Futures trading