To be honest I think the whole 'percentage' thing is deceiving, most people don't think logarithmically, and most people won't realize that you only gain at the highlight end of the light scale.
In Wide mode you have access to three different modes for 'mixing' Auto where the camera decides (depending we assume on how much R-Pixel data there is), Wide 1 (described as 230% just over 1 stop more) and Wide 2 (described as 400% about 2 stops more). Selecting the Wide option mixes data from the two 'Pixels' to create the final image. Selecting standard uses only the S-Pixels (hence would be pretty similar to the S2 Pro in terms of dynamic range). The S3 Pro provides four different options for dynamic range, firstly you have to select between 'Standard' and 'Wide' dynamic range on the camera menu. Note that for ease of reading we're using Fujifilm's nomenclature of an (input) Pixel however the correct term would be photodiode. The S3 Pro has 6.17 million of each type of pixel (12.34 million effective total), however it's important to understand that the R-Pixels are only used to extend dynamic range they do not increase image resolution.
(This is supposed to be similar in effect to film which has different sizes of 'grain' which are sensitive to large or small amounts of light). The camera's image processor can then combine the values of these pixels to extend the dynamic range of the image. Fujifilm refer to these as the S (normal sensitivity) and R-Pixels (less sensitive). The S3 Pro's unique selling point is that it is the only digital SLR to have an extended dynamic range, it achieves this by the use of two interleaved photodiodes.
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