Parts of "Superman Returns" converted into IMAX 3D

The Warner Brothers feature Superman Returns will become the first live-action studio feature to be released in part in IMAX 3D, using a proprietary 2D-to-3D conversion system.

As "colorized" is to black and white movies, "dimensionalized" will soon be for conventional footage which is later converted to stereo. Don't know about that "visual cue" part, though — snip from press release:

IMAX Corporation will use its proprietary 2D to 3D conversion technology to convert approximately 20 minutes of the film into An IMAX 3D Experience (…) The film will be simultaneously released to IMAX® and conventional theatres on June 30, 2006.

During select sequences of the film, a visual cue designed by Singer will indicate when audiences should put on and remove their IMAX 3D glasses.

Link to press release. (Thanks Warren Betts, and thanks for the correction Mike Stubbs)