It seems like they are preparing for more exits, the world has changed a lot in one year.
I am of the opinion that the days of the EU are numbered. High unemployment, slow growth, combined with African & Middle-East immigration and Muslim fundamentalism are going to put increasing pressure on traditional social-democrat parties, and with this a general momentum (Brexit, Trump). It may be that the UK might enjoy the status or independant safe heaven when it all happens and investors run to the door and that Brexit turns out to be a blessing in disguise.
The problem as I see it, is that the EU is trying to stop the tide. I believe this will fail due to the sheer amount of frustration felt by many of the populations who have not necessarily received or appreciated the globalisation as it has been implemented so far.
Unfortunately for the EU, the only changes that could save itself are antithetical to its hardcore believers and leaders who are in charge. Those who are looking to turn Europe into essentially one country (sounds crazy, but that has been the long and relatively successful game from the beginning), will not budge on a few key issues which are vital to their end game. The David Cameron negotiation was an example of this. If the EU had dropped Freedom of Movement, UK would have almost certainly remained.
Ideology vs pragmatism. Old story.
The federal goal however is never what the people of Europe were sold. This mission was essentially hidden to the people of the countries as it was sold as a trade union. They likely knew that the people of these countries would be almost completely opposed to the United State of Europe and so very slowly and quietly implemented measures to achieve it. With the new calls for an EU Army one step closer to this I think we will see greater resistance to the grander project.
If the federalists give up on their hidden dream of the Europe becoming a single country, they can save the EU.