This new version brings a lot of configuration and integration features:
* Dedicated Launcher with high customization
* WebLab-Client to manage all portlets access easily
* WebLab portlet filters to configure portlets event the simple way
* Search portlet has easier filters management
* Execute several processing chains at the same time
and much more, see the release note at http://weblab-project.org/index.php?title=WebLab_1.2.5/Bundle_Release_note