Who said all the prototype transportation vehicles had to have wheels? What if you are disabled and have to go up the stairs or what if you had to carry something really, really heavy? Toyota's iWalk seems to be coming straight from this arcade game I used to play called "Captain Commando" where a little baby and some bad guys were riding these things and using it to lift and throw others :P I think it would be amazing to see this one in action - and no I don't mean throwing bad guys, I mean walking and helping people with movement issues. For all those interested to see it in person - this can be found in Odaiba/お台場 in Toyota's museum.
And for comparison, this is what I was talking about when I mentioned the game - similar no? :)