German Chancellor Angela Merkel and French President Emmanuel Macron will sign the "Aachen treaty" later this month which will govern a coordinated diplomatic front as well as joint actions on peacekeeping missions. 

What's more - areas on both sides of the Franco-German border will be encouraged to establish "Eurodistricts" in which both countries would merge water, electricity and public transport networks. 

Berlin and Paris will offer cash to incentivise these cross-border areas, which could involve shared hospitals, joint business schemes or environmental projects. Some officials regard these experiments as a petri dish for the integration of the EU. -The Times

No word on whether France will accept half of Germany's refugees.

Additionally, both countries will lobby for Berlin to receive a permanent seat on the United Nations security council, where France already sits with the United States, China, Russia and Britain. Berlin was elected to the council as a non-permanent member last June.