I don't think anything's going to happen until EU citizens' rights are sorted out
And with the news about the Home Office sending out a batch of 100 letters to EU citizens threatening deportation, which is the latest in an ongoing problem since last year, the EU will just say that they're not talking about anything else until EU citizens in the UK are guaranteed their rights and have ECJ oversight. The Home Office has just shown why it can't be trusted without ECJ oversight.