According to this Guardian article:
"Nolan’s second world war epic the most widely released 70mm film in 25 years. They are piggybacking, to some degree, on the Weinstein Company’s work convincing theater [sic] owners to procure functioning 70mm projectors in advance of Quentin Tarantino’s The Hateful Eight."
The article goes on to applaud the "automatic prestige" of shooting on this format - an echo of my own sentiments comparing 16mm to camcorder shoots.