AppleInsider and ThinkSecret have posted similar claims that the Pro line will receive a boost next Wednesday.

PowerBooks are expected to gain HD resolution screens, DDR2 memory, larger hard drives and a new chipset. They have stated that processor speed may not be updated at all.

As for PowerMacs which are expected on Wednesday 19th also. The new systems are expected to be based on the long rumoured 970MP PPC which was announced back in July. AppleInsider had more details claiming 4 processors cores to be present, PCI-E and a dual layer SuperDrive. ThinkSecret is a little more conservative and reports that DDR2 is too be included and PCI-Express but not much more than that.