"en-us" short date pattern

Hi,

In the latest version of Windows XP the short date pattern for some locales
went from 2 digit year to 4 digit year, including "en-us".
I would like to know if there are plans to do the same in ICU (I don't imply
that MS is a standard, but I wonder if this is something internal to MS or
they are following a change in standards).
Is there a standard the current ICU "en-us" patterns follow?

Thank you,

Alex.

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