"A major problem with the idea of making VR32 wearable, according to Makino, was that Nintendo engineers were concerned about placing a chip with high radio emissions near a user's head, since the safety of EMF radiation on the brain had yet to be thoroughly studied. Its proximity also produced visual noise in the displays. 'This meant that the internal CPU had to be covered by a metal plate,' says Makino, 'which made the whole system too heavy, forcing the goggle concept to be abandoned.' Not long after, Yokoi's console evolved from a strap-on headset into a heavier device that one could prop up onto one's face using a clumsy shoulder stand. Again, Nintendo's legal department feared liability issues; the device might cause children to fall down a stairwell while playing. ... Hobbled by liability concerns, VR32 soon evolved into a bulky red viewport mounted to a bi-pod that rested on a table."
They "created a prototype headset (PDF) that includes a translucent LCD panel sitting about 1cm in front of a standard, opaque LCD. With some GPU pre-processing, this 'light field stereoscope' headset can display nearby objects on the front LCD and farther-away objects on the rear, creating what the researchers call a '4D' image that layers a basic virtual light field on top of the usual stereoscopic left/right eye 3D separation." This provides an easy, low-tech way to let the eyes focus more easily, and alleviate the strain that causes headaches.
If you look at the letter from IMAX (PDF), you'll see they think the reference to IMAX is "misleading to readers." They further request that "all future articles regarding this "room-scale" virtual reality system make no reference to our registered trademark." Apparently, IMAX has never heard of the Streisand Effect. Update: 06/19 19:26 GMT by S : IMAX has apologized.