Like all things WiFI, the alliance will think of something, then it will take the IEEE a thousand years to ratify it but by which time all vendors will have spun off their own slightly different non interoperable versions and we'll all end up having to buy even more chips/devices which support it etc etc! 802.11n case in point.
WiFI alliance is a bunch of vendors who agree on stuff between them, so should be pretty good. Once they think of it its not standardised until the IEEE ratify it, and that takes ages. Hence the potential for variance.
Big problem with 802.11 is power. This was the point of Bluetooth, less power for a personal area device/standard.
