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In the user guide, under Basic Info, the changelog is available up to 2.0.1. In the CodeIgniter news section, the post CodeIgniter 2.0.0 Released says:
Some of the big changes to happen in CodeIgniter 2.0 since CodeIgniter 1.7.3 are:
Support for PHP 4 is gone, PHP 5.1 is now a requirement.
CSRF Protection built into the form helper
Drivers
Application Packages
Scaffolding, having been deprecated for a number of versions, has been removed.
Removed the deprecated Validation Class.
Plugins have been removed, in favor of Helpers.
Added routing overrides to the main index.php file, enabling the normal routing to be overridden on a per “index” file basis.
Added $route[‘404_override’] to allow 404 pages to be handled by controllers.
50+ bugs fixed
Reactor contains all of these above and some nice changes of its own:
Full query-string support
Automatic base_url detecion if left blank
New Cache driver with file system, APC and memcache support
Command line compatibility for easy cron jobs
20+ tweaks and improvements
If that isn't what you were looking for I apologize. I am fairly new to CodeIgniter.
