We would expect Apple to use a combination of both cores, Cedar Mill for their entry level Powermacs, Presler for their high end SKUs and potentially even a HT enabled Extreme Edition for their highest end Powermac. Given the strong brand that Apple has created with the Powermac G5 name, we do wonder what they will call this next-generation of Intel based Powermacs; somehow, the Powermac P4 just doesn't sound right, not to mention that the name Pentium 4 has been left behind since the move to dual core.
With Intel's dual core processors, Apple can effectively offer the same TLP as their current dual processor G5s with only a single CPU socket in next year's Intel solutions. If you've ever looked at the cooling solutions required for Apple's 2.5GHz or 2.7GHz G5 systems, being able to cut that down by a half would definitely help lighten up and reduce the cost of producing/shipping their machines. One advantage that the G5 does currently have is that its die is extremely small, measuring only 66 mm2 compared to the 206 mm2 Pentium D die. The move to 65nm will help Intel, but the G5 definitely has a size advantage. However, with Intel's volumes, it is unlikely that the die size advantage will translate into any pricing advantage for the PowerPC chips over Intel's solutions for Apple.
