Mammals shrink on islands and smaller ecosystems. See pygmy elephants in islands in India. It's reptiles that increase in size.

Can't be too sure about it, but prima facie it seems that this WMM thing is not a change at the physical level (which means it is not a new addition to the b,g,a .. series). The change is most probably at the MAC level/network management level which again should not lead to buying of new equipment. Its just got to do with providing a higher priority to streaming to ensure a better QoS.

Well, most of technologies do provide a higher priorty for streaming anyways, so essentially what is unclear is how much of a higher priority is streaming being provided under WMM ?