From Moveable Type: I can’t wait…
“A small sampling of some of the features that will be in Movable Type Pro: Improved author management, Remote publishing, Custom entry fields, Integrated spellchecker, Registration for comments and posting.”
Here’s some more information from the official Six Apart press release:
“Along with its improved customization and author management, Movable Type Pro will offer enhanced weblog publishing tools. Email notifications to weblog readers or mailing lists will be vastly improved, along with the addition of custom entry fields, workflow, and an integrated spell-checker.
Other features have been added in direct response to user feedback, including photo album integration, a weblog-aware traffic and statistics system, and an option to require user and visitor registration.”