Are you on an earlier version of Optimizely CMS and don't know if you should upgrade or not? Have a look at the table on this page and see all the nice features you're missing if you don't.
Hover over a link to see the exact version for the feature release.
Note: This is just a selection of features that have an impact on the user interface. For a complete list of new features, bug fixes, and improvements, see our Release notes. You can also see our quarterly summaries in New features in Episerver.