Two new DEPFET concepts are presented motivated by potential applications in adaptive optics and in synchrotron radiation experiments at the future Free Electron X-ray Laser (XFEL) in Hamburg. The gatable DEPFET structure allows the selection of signal charges arriving in a predefined time interval. Charges produced outside this gate interval are lead to a sink electrode while charge collected already is protected and kept for later delayed readout. In synchrotron radiation experiments one faces the challenge of being sensitive enough for single X-ray photons in some parts of the detector while on other regions a very large charge due to the superposition of many X-rays has to be measured. A DEPFET with strongly non-linear characteristics combines naturally excellent energy resolution with high dynamic range, large charge handling capability and high read out speed.