I don't entirely understand the point of this trailer, but here we have it, anyway. Maybe it makes sense in the context of a cinema screening, before Despicable Me 2 or something, but on the internet?
The new, 3D version of The Wizard of Oz is getting a week in US IMAX cinemas from September 20th. The Blu-ray 3D release is set for a couple of weeks later on October 1st. I'll wait for the disc, thanks, though I am definitely curious to see how the film has been dimensionalised.
The most obvious decision the stereographers might have taken is to tie in the amount of volume to the change from sepia to colour. I hope they've had more ideas than this, though.