A pilot project, which has been required to use Model Driven Development principles has just launched at my work. So here comes a quick gathering of information on the subject.
Tools for UML2 modeling
UML2 model native via EMF in eclipse:http://www.inf.uni-konstanz.de/soft/teaching/ss07/seminar/cerbu.pdf Exports the models in the XMI format but model is displayed as trees.
We need to use topcased (open source) or other proprietary software to provide graphical editing of the model. This french project, that just reached version 2 seems very active at the moment.