As you can probably say by just looking at the calendar, the entire Macecraft team is working on the upcoming PowerTools 2008 version.
The PT 2008 release focuses on improving the current set of features. Of the improvements I can at this point say at least that the speed of the Registry Cleaner and Registry Finder is highly optimized. We are still working on it, so I can't yet say any numbers but what I have seen so far makes me very confident that we will be able to boost the performance of these tools significantly.
In addition, there will be at least one new major feature (i.e. new tool to the Main Window). I believe this will be a big surprise for everyone. This feature is already implemented.
One of the existing tools will be fully rewritten. I can't yet say which one, but its one of the five first tools of the Main Window. This is also pretty much done already.
Also, there will be quite drastic changes to the main user interface (i.e. the Main Window).
The ETA of the first beta version is December 2007 / January 2008.