What possibilities does Wimax offer?

Wikipedia discusses Wimax and states that:

WiMAX is a possible replacement candidate for cellular phone technologies such as GSM and CDMA, or can be used as a layover to increase capacity. It has also been considered as a wireless backhaul technology for 2G, 3G, and 4G networks in both developed and developing nations.

Whether or not Wimax is going to be used by 2015 is another question. Wimax is a kind of in between technology with respect to mobility and speed. See the following diagram.