The camera that you want, has not been built yet.

The camera manufacturers are trying to improve low light performance, but they have a ways to go.

I don't know of any manufacturer trying to improve low light performance on a rugged type digital camera.

There are about 8 or 9 cameras that are above average in low light.
But you have to realize that average is poor.
The Canon S90 method of improving low light was to use a bright lens and a sensor that is larger and with less megapixels which reduces noise.
Sony now has a "back lit" CMOS sensor that is better in low light, but they have had mixed results in picture quality with that sensor.
The sensor seems to be OK, but they just have not gotten a handle on how to integrate it into a camera.
By next year they should get it right.

For now, look at the Canon S90.
But don't expect miracles.