The developing of LaTeX3 goes on. However some feature will be improved or added. The LaTeX3 team can't upload every day a new version to CTAN.
How can I install the newest version LaTeX3?
The LaTeX3 team is well presented in the web. The current development branch is available at LaTeX Project - Source repository
To download the newest version you can use svn.
For Unix users
The following command download the complete trunk folder to the current folder of your opened terminal
The LaTeX3 team provide a great combination of
A small script can be
For Windows users
The LaTeX3 team provides a file