This response just in from No10:
The Civil Aviation Authority (CAA) has been successful in ensuring that the UK IMC rating will remain in place during the four-year transition period, from the national regulations on flight crew licensing to the regulatory system governed by European Aviation Safety Agency (EASA). EASA has agreed to establish a rulemaking group to consider proposals for a similar rating at the European level. The Department for Transport will be working closely with the CAA and EASA to identify a solution, prior to the end of the transition period, to ensure that the privileges of IMC rating holders are protected.
Which isn't bad at all. No real news, except that the DfT will be involved with CAA and EASA.