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Presumably 2.5.3 is a small bug-fix patch, and as such is a much smaller file than the major 2.5.2 upgrade file, so Amazon sends it as soon as a 2.5.2 Kindle syncs with the Amazon site (whereas it appeared Amazon was throttling the number of 2.5.2 files that would go out over Whispernet at any given time). It also appears that the K2-us either does not need the patch, or else they haven't released it, as it seems nobody with a K2-us at 2.5.2 has upgraded to 2.5.3.
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