Hi adam sure you can try either version 4.4.3-SNAPSHOT or 4.5.0-SNAPSHOT;
to setup our development repository follow this guide: https://community.jboss.org/wiki/MavenGettingStarted-Users

please share your results, and feel free to make further suggestions! Just keep in mind that we will be very conservative on these branches currently, so unless you propose patches yourself we will probably not act on your feedback until we'll be closer to deliver 5.0 (still that doesn't make your feedback less valuable).