http://www.pentaxforums.com/articles...ing-works.html

The Pentax K-3 II debuts an innovative feature called the Pixel-Shifting Resolution System, a type of super-resolution technology that increases the effective level of detail in images without requiring a higher sensor resolution.
In this article, we will describe the traditional Bayer sensor implementation and compare it to Pentax's new pixel-shifting system. We will also explain how the technology works and what benefits it can deliver to the photographer.
Interesting and sounds quite brilliant