Dunkirk director Chris Nolan presented a longish highlight reel during last month’s Cinemacon. It was visually commanding and certainly gripping as far as it went, but this extended trailer, released today, has more sizzle, or should I say drizzle? I’m not detecting any implications of a story or thematic arc here. I’m sensing a carefully composed, super-costly IMAX variation on The Longest Day, or at least a similar espirit de corps feeling — a war movie that’s not so much about victory or defeat or a grotesque misjudgment (which is what A Bridge Too Far tried for) as much as brotherly love.