OpenCart 2.2 is now replaced by OpenCart 2.3.x, there are not many changes outside of the developer view so if you are looking for a new website we would now recommend developing in OpenCart 2.3.x.
OpenCart Version 2.2 Additional Functionality & Updates:
Along with a selection of improvements and bug fixes, OpenCart 2.2.0.0 now features:
Support for Composer based libraries
Improvements & changes to the events system
3 brand new payment gateways included in the core
Multi-language installer
Changes to template rendering to reduce code repetitiveness
Latest version of OpenBay Pro, now with support for Fulfilment by Amazon