So - right after the May announces snap elections, a convenient leak happens:
Brexit: leaked documents say EU wants Britain kept under European courts | Politics | The Guardian
Rather clever and well played by May, IMO. Labor and the Lib Dems are unlikely to be able to come up with a unified and clear response, and now May gets to run on a nice clear "fight the european hardliners, get rid of EU legal jurisdiction in the UK, get out of paying europe" ticket.
If Labor responds by having the now traditional internal punch-up when faced with a perfect opportunity for effective opposition politics, if they cannot agree with the lib-dems on a clear stance, and since the SNL is likely to scare voters into the arms of the hard Brexiteers, May could end up sitting pretty with a clear mandate. Divide and conquer, baby.