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Sony and Pentax, and probably others, use a shift mechanism in the sensor (movable sensor) for image stabilization.
While I see many benefits with this approach, how are these sensors protected against dust and humidity? Are these cameras more susceptible to the sensor sticking (somehow), and if so, without the user noticing?
Dust and humidity can be an issue with any camera, those that are weatherproof, when used with a suitable weatherproof lens, have less of a problem.
The presence of a sensor-shift stabilization has no impact. What you should know is that the majority of cameras have a mechanism to shake the sensor which in fact used to remove dust! Others shake the sensor to compensate for movement, simulate an anti-alias filter or capture super-resolution. This adds features and obviously requires more movement latitude but most sensors do move. There are a few cameras which have a fixed sensor and use a hot-filter in front of the sensor to prevent dust from entering the sensor area.
