AppleInsider has recently reported that Apple will make a significant architectural change within Macs in the near future.
The rumour site explains that in 2006 when Apple announced its move to Intel processors the company abandoned the use of custom chipsets on its motherboards. Instead Apple began using the same chipsets as the rest of the of the PC industry.
AppleInsider goes on to reveal that Apple will forgo adopting the Intel Montevina chipset in its next generation of notebooks and that Apple could use a chipset not made by Intel at all.
Apple could use chipsets from NVidia, Via or AMD or alternatively the company could return to its PowerPC practices and manufacture a propriety chipset.