Your picture is from Mide, an engineering company that worked with Sikorsky on their AATD program offering nitnol-based active trim tabs. Sikorsky's actual AATD blade ended up being a S-434 blade with an electric linear motor and bellcrank, as the nitnol has a litany of issues.
There are a few AHS whitepapers out there with studies by DARPA using piezoelectric actuators for active trailing edge flaps, albeit with some inherent flutter and response issues at frequencies necessary to be actually useful (for vibration and acoustic attenuation).
Very large bandwidth trailing edge flap motion and sizing could be used for primiary flight control a la Kaman. Piezos are inherently unsuitable for these applications, regardless of that press releases you read from Eurocopter
Even the MD900 blade with the force multiplying X-frame apparatus for piezos could not demonstrate full spectrum response and deflection.
Boeing, Sikorsky, and Bell have also been working with active blade flaps for some time. Nothing has been developed into a production application at this point.