Batman-On-Film has reported that they've received word from one of their sources on possible new modes of transportation for the Caped Crusader in Nolan's The Dark Knight Rises. As we all know, the Tumbler was destroyed in the last, so obviously they'll be working on a new Batmobile of some sorts. There may be other modes of transportation as well, though.
Some people may consider stuff like this a spoiler, so BOF has blacked out the potential spoiler information, meaning you'll have to scroll over and highlight the blacked out area to read.
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I wouldn't be opposed to some sort of bat-plane/jet. Since the Tumbler was designed for the army, it's feasible that Lucius Fox would have designed other toys for the military that would involve planes or helicopters. I don't think the Bat-Sub will make it though.