The C137 is the first production Rafale equipped with a production RBE-2 AA (AESA). It is also the first of a kind in Europe. It is also equipped with the brand new FSO and the new DDM-NG.
This is the result of a more than 10 years sustained R&D efforts. The aircraft should undergo an 18 months period of tests and experimentations (discovery of new possibilities) before entering operational service.
Source : DSI Presse
edit, video of the C137 rool out :