- Revision history table with date+time, revision notes and author
- Ability to compare two versions of an article visually
- Ability to revert to selected revision, or the most recent revision
- Ability to Thank for a revision
Bonus points for considering...
- ORES quality prediction
- Tags support
- filter and search (date range, tag and comment based)
- Links to user pages and history for page contributors
- page lock/permissions
Some other stuff to consider/discuss:
- Deleted information (oversighted, etc)
- flagged revs wikis (current active revision indicator)
- view a revision as though it was the current one? (rather than as a diff)
- pagination/support for long histories
- live update mode?