It turns out that Adam Szymczyk, the director of Documenta 14, has put a lot of thought into showing the entirety of the Gurlitt hoard of 1300 works:

Szymczyk, who has been pursuing the project since his appointment in late 2013, said that he had a “very constructive meeting” with Matthias Frehner, the director of the Kunstmuseum Bern. But the museum’s board of trustees “did not share this interest”, he said. He also contacted Monika Grütters, Germany’s minister of culture. The ministry told him that works that remain in Germany could only be shown “for the purpose of informing about the history of persecution of the original owners” and so that heirs can claim what is rightfully theirs. Szymczyk says that would be “exactly” what would be achieved by showing the entire hoard at a venue such as the Neue Galerie in Kassel during Documenta. “In a quiet way, almost neutrally, maybe just arranged chronologically.”

Documenta director wants to show all the works Gurlitt hoarded (The Art Newspaper)