WiMax to some people is nothing more than a question you ask Max
A new FCC filing for an Intel 5350 WiFi/WiMAX combo card that fits into Mini PCI Express slots is probably the best evidence yet for future WiMAX functionality in Apple MacBooks, but it’s still far from a confirmation.
The bottom line is that with the new card, the WiMAX option officially exists for MacBooks, but as of yet there are no drivers written that would allow it to work with Apple’s line of laptops. You could actually hack your laptop and plug the card in just fine as it is now, but without the drivers (which do exist for Windows), it’s pretty useless. That said, the drivers—especially with Intel Macs—are a mere Leopard update or MacBook redesign away.