Its not really surprising that they don't have answers though as its probably subject to future negotiations and decisions that haven't yet been made. The embassy can't make promises on behalf of a foreign government. It's definitely uncertain and there will be a hell of a lot of work involving in unravelling the situation.
Another aspect for consideration is things like the FTA we have between the EU and places like Korea, Israel, Turkey, Mexico, etc. All of these would be subject to renegotiation and any work towards FTAs with places like China and India would be reset.