You can use svn to get the latest version from github.com/openwebwork
For instructions of using svn with github go to
the instructions are pretty straightforward.
There is a README in the webwork2/conf directory for working with the new configuration files.
It's best to get new versions of both the webwork2 repository and the pg repository from github.com/openwebwork.
Complete docs still need to be written which is part of why the newest version hasn't been pushed to the svn repository yet. (Exam season is the other reason :-) )