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It's not unprecendented but I think the only example is Happy Feet IMAX 3D that had trailers and was released 2D only.
In that case the film just wasn't locked early enough to release in 3D and they didn't want to delay it.
Some 'Piranha 3D' [PIRAN] Set Photos [Warning: Gory Makeup] Jan 20, 13:26
chud/styd are question whether it will even be in 3d. :( Jan 20, 13:31
Worst Previews claims they've been getting emails all day from the production staff claiming it's absolutely untrue Jan 20, 14:05
ShockTillYouDrop.com cleared up the 3D rumor five days ago. Jan 20, 14:34
The 3D trailer already played in front of some AVATR. {nm} Jan 20, 14:16
It's not unprecendented but I think the only example is Happy Feet IMAX 3D that had trailers and was released 2D only. Jan 20, 14:23