Right now the plan is to do a push for real php5 code (object orientation, singletons etc). The problem is that phpCAS requires a major overhaul since the client only is already a monolithic 2800 lines monster that gets worse every day. This is a lot of work and since there is a lack of developers we are planning a 3-stage transition to get the job done. The first stage was a 1.2.x version that will drop php4 support and include some of the features already in the queue. As a second step we will have more minor 1.x versions as we improve/rewrite parts of the client. The third stage 2.x will be a restructuring and rewrite of large parts of the client and an major api change.
1.1.x (legacy version, EOL)
1.2.x (legacy version, EOL)
1.3.x (current stable version)
The release is actively developed. Please check the bugtracker for progress on specific isssues.
2.0x (planning stage, subject to change)