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and onto Mickeyj.
Regarding the patches, from what I can gather, v1.13 was an 'add on' to v1.12 rather than a complete patch, and was issued to some players over at CDG for testing, who then leaked it. v1.15 is also an add on - hence the recommendation to install v1.13 first.
I believe that v1.15 is based on Soren Johnson's model for corruption, which he describes as follows:
So it seems that we now have corruption calculated as it was originally intended, which was why I was keen to install the patch. However I'm not trying to dictate terms here by any means, and if we would all rather stick with v1.12 until the end of Feb, then I've got no problem with that whatsoever! 
Regarding the patches, from what I can gather, v1.13 was an 'add on' to v1.12 rather than a complete patch, and was issued to some players over at CDG for testing, who then leaked it. v1.15 is also an add on - hence the recommendation to install v1.13 first.
I believe that v1.15 is based on Soren Johnson's model for corruption, which he describes as follows:
This is how corruption works now. (1.15 beta)
There are two kinds of corruption, distance-based and empire-based.
Distance-based is determined by the distance from the city to the nearest seat of government (Palace, FP, SPH). The farther the distance, the higher the corruption.
Empire-based is determined by the "city rank," which is calculated by assigning a number to each city in progression from the capital outward. The higher the city rank, the higher the corruption. Further, if the city rank is higher than the "optimal city number" (OCN) - which is map-dependent - the rate at which empire-based corruption goes up increases.
These two forms of corruption are additive. Thus, if a city has total corruption, it might be from high distance-based corruption, high empire-based corruption, or medium amounts of both.
Building a Forbidden Palace (or SPH) does two things. First, it provides a new center for cities to measure their distance-based corruption. Second, it increases the OCN by 3/8 (was 1/4 in 1.13).
This method is how corruption was originally intended to work. 1.12 and 1.13 use this model (the main difference between the two being the FP increase in OCN). Civ3 and PtW did not quite follow this model because there was a bug involving how city rank was calculated.
This "new" model allows for two cores, with the second being weaker than the first. One interesting aspect of this system is that it doesn't matter how far the two cores are apart from each other as distance-corruption is calculated from the FP and city rank is an absolute number (9th city, 10th city, etc.). I mention this only to show that building one's FP on a new continent can be very worthwhile.
There are two kinds of corruption, distance-based and empire-based.
Distance-based is determined by the distance from the city to the nearest seat of government (Palace, FP, SPH). The farther the distance, the higher the corruption.
Empire-based is determined by the "city rank," which is calculated by assigning a number to each city in progression from the capital outward. The higher the city rank, the higher the corruption. Further, if the city rank is higher than the "optimal city number" (OCN) - which is map-dependent - the rate at which empire-based corruption goes up increases.
These two forms of corruption are additive. Thus, if a city has total corruption, it might be from high distance-based corruption, high empire-based corruption, or medium amounts of both.
Building a Forbidden Palace (or SPH) does two things. First, it provides a new center for cities to measure their distance-based corruption. Second, it increases the OCN by 3/8 (was 1/4 in 1.13).
This method is how corruption was originally intended to work. 1.12 and 1.13 use this model (the main difference between the two being the FP increase in OCN). Civ3 and PtW did not quite follow this model because there was a bug involving how city rank was calculated.
This "new" model allows for two cores, with the second being weaker than the first. One interesting aspect of this system is that it doesn't matter how far the two cores are apart from each other as distance-corruption is calculated from the FP and city rank is an absolute number (9th city, 10th city, etc.). I mention this only to show that building one's FP on a new continent can be very worthwhile.
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