The author has plotted the data from the TLPD database - ie TeamLiquid statistics for tournament results (excluding MLG Dallas) at the International level and at the Korean level.
It appears that the international level, tournament results are approaching close to a 50% winrate for each match up. However, in Korea Protoss has been getting absolutely murdered in recent tournaments, with win rates of 33% of ZvT and 30% of ZvP. The Korean data set is a much smaller sample size, so you would expect some volatility, but even so, the results are quite extreme. I guess the real question will be whether this is an outlier or the beginning of a trend - perhaps we will see some reversion to the mean in the data for next month.
If there is a real difference between Korea and the rest of the world, I am really curious to know what is driving this. Currently, Protoss appears to be fairly even in international tournaments, but almost unplayable at a professional level in Korea.
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