I have some bad and some good news.
The bad first, until we manage to have full continuous integration in order eXpand new features to be immediately available (nightly builds) we are not going to make any more releases. eXpand release policy will be the same as DevExpress that is we make a release exactly after DevExpress
And now for the good. eXpand will provide build scripts that you can use them to compile the source code. The trunk of source code will contain the most current work.
So you first download the code by going to http://github.com/eXpand/eXpand
and along with the code a set of batch files will be downloaded.
You just double click at buildall.bat and eXpand will be compiled and register to the gac. To unregister it use the clear.bat.