It doesn't provide an answer to the question above but I thought I'd reuse this thread to flag up this review
of the WX1 over at Photography Bay. The depth of the review is, IMHO, limited but there's one high ISO comparison shot between the WX1 and the new Canon PowerShot G11 which shows how well that new Sony Exmoor R sensor may be performing.
Unlike the reviewer I wouldn't have expected the G11 to "trounce" the WX1 as the crop factor of the G11 is 4.6 compared to 5.65 for the WX1. If I've got my sums right that means each pixel on the G11 can collect light at 1.5x the rate of the WX1 pixels. The reviewer doesn't bother to share the rest of the shooting information of the sample ISO 3200 shots but I think it's a fair assumption that both cameras were using their largest apertures. That's f/2.4 for the Sony at close range and f/2.8 for the Canon. That means that the Sony lens is providing light at 1.36x the rate of the Canon lens so the combination of pixel area and lens aperture would only put the WX1 at about a 10% disadvantage when compared to the G11 if the sensor technology was identical
But it's not, as the Sony sensor is one of the new backlit Exmoor R jobs, and on the basis of that one comparison image in the review it looks as thought the WX1 is really delivering the goods.
Image courtesy of Photography Bay. Click to read the review