Mylaensys have just publicised on their blog the fact that they are working on an integration between DHTMLX and Apache Isis. 

They previously have integrated DHTMLX and Spring Framework (DHTMLX Spring Link), so they have a proven track record... and I've been impressed how quickly they've produced some early prototypes.

If the idea of rapidly building domain-driven apps with a customizable UI appeals, then keep an eye on their progress through the Apache Isis mailing lists.