I vote for Major Upgrade, new features, enhancments etc.
- New hooking features, multi-hooking(same file multiple hooks), timer based hooks(ex, a cron sort of thing)
- All configs, settings etc, should be code, not the commented crap(leave old method for backwards compatibility)
- Advance install/uninstall API, IE on install before or after core install, it can be set, to code your own menu/options, or atleast flag options to come up, ex On install ask if they want to drop a SQL table and re-add it, or ask if they are upgrading, to run upgrade code, on uninstall ask if they want to drop it.
- New functions that are friendly for Plugins, such as easy config change functions, etc
- Prob more but i'm drawing a blank now.