The good folks over at Thomson Reuters have done an analysis of global patent applications and by their reckoning 3D is comin' at ya in a big way and soon!
Three areas showing a great upswing in patent activity are 3D television (Ralph Kramden's long-delayed desire may finally come true*); 3D digital photography and 3D cinema (projection systems & specialized glasses).
Here's the link to the complete PDF report.
*In a classic Honeymooner's sketch "TV or not TV" originally aired on October 1, 1955, Alice wants Ralph to buy a TV so she can watch Liberace. Ralph's reply is that he's "waiting for 3D TV" before he'll buy a set.