I posted a fair while back on here - before VR had come back with a bang with PlayStation's effort - that I felt the next area of focus would/should be new sophisticated haptic feedback peripherals to complement the immersion, so I'm just glad the technology seems to be out there right now, or is being worked at as a sort-of priority for at least one major videogame hardware developer. Can't be arsed digging around my history for it now, but devices that can deliver very intricate tactile sensations that your nerve endings can interpret as the real physical interactions of virtual objects (or whatever) in the virtual world, that seems very exciting to me, someone who wants games to really start pushing back the frontiers of immersion now.
There are of course always daft 'hacks' you can do for yourself to simulate atmospheric tactile stuff that'd be very difficult to achieve with just a fancy little gaming peripheral, if you can ever be arsed (ambient temperature, breeze, etc. - just set up some swivelling fans and mess about with the thermostat, lolz), but the sensation of unique recoil from different projectile weapons or bullet calibres, of holding an object containing detectably-different materials, coming in contact with in-game forcefields, the awe-filled buzz of firing up a light sabre in your hand and the impact of its different strikes... sounds pretty boss, the concept just makes my imagination run wild.
It seems to me like the next major, technologically-feasible consumer development in immersion for VR/AR, while smell-o-vision remains a fanciful notion (I know about the South Park fart-mask; kinda limited applications for that!). Vision & audition are already well on their way (you could argue that the audio side is already near-perfected with binaural 3D recording and a sexy pair of cans), olfaction is still far road off being satisfactorily implemented with videogames, and gustation is basically pointless in this context, so tactition has to be the next area of focus that we can get proper stuck into right now. Kudos to Nintendo for promoting it now, I say, even if they likely won't be the ones to explore its full potential. Hopefully the tech'll be freed up to developers across the board before too long, and start bringing strange new dimensions to games.