Whilst the Foveon has been virtually death, Fuji and Toshiba has recently filed new patents for their newly designed layered sensors, here and here (Google translated), via Photo Rumors.
(Fuji's design)
(Toshiba's design)
Let's see if there will be any real (IQ) performance breakthrough to come then, provided that these patents are materialised.
Speaking of patents and what's Pentax related, Hoya has also filed a new patent for the correction/debug of their "floating" body sensor-shifted SR system for the inclination problems that may arise.
Related:-
In-Body Anti-Shake Patents Fully Dissected