The question right now is what defines a "select, IMAX cinema." While the rumor has long been that the prologue would be stamped in front of screenings of "Mission: Impossible -- Ghost Protocol" (which opens wide on the 21st), more recently, AMC announced (and they quickly pulled) news that the preview would only play on 70mm capable IMAX screens. That would make a tremendous difference, as it would exclude those tinier, faux-IMAX screens that have been added to multiplexes around the country. More details likely to come soon, and as usual, the fimmakers are remaining coy on what we'll actually see only saying that it's "an introduction to Bane, and a taste of the rest of the film."
Until then, some hi-res scans of Empire's new images from the film have landed online (via Comic Book Movie), one of which you might remember from the leaked set photos earlier this year. "The Dark Knight Rises" hits on July 20, 2012.