See Mitts new posting.
You have 21 days to evaluate after install, then you need to but a licence from the Forum Pro
The most important feature is sensible error messages when an problem occurs.
The Developer version will be the one for most people.
Carbide Express will remain free.
It will launch next month ,i got confirmation in Series 60 Day event.
It's already out. It launched this week and is available for purchase on the Forum Nokia eStore.