Junker has appointed the Frenchman Michel Barnier as the EU commission's Brexit negotiator.
It's an "up yours" gesture from Junker to appoint the most anti-British figure he could find. Luckily the EU will soon be disposing of the failure that is Junker, and I guess his negotiator will follow or be sidelined by some other appointees who actually want to negotiate for the common good.
http://www.bbc.co.uk/news/world-europe-36901875
I don't think this guy will be of any great consequence. He is the Commission's negotiator, but it won't be the Commission who do the negotiating. That will be supervised by the Council of Ministers. It's just another name to add to the seating arrangements for the next few years.