Codeigniter 4 has been in the works since 2015. It took almost 3 years to have a basic framework working and 2 more to document everything so we can use it in production. This is very exciting news, since codeigniter still holds a place in me. It was PHP framework that I use the most and I still use version 3 at work.
If you are following CICON 2011 yesterday, then you no doubt already heard from the Reactor team: CodeIgniter is now using Git for source control, and has moved its home to GitHub. Also, CodeIgniter ...Core“ is not longer being publicly maintained. CodeIgniter ...Reactor“ is CodeIgniter, so we are dropping that suffix. In short: CodeIgniter is the framework, and Reactor is our community driven development program.