[android-developers] Google Play Smart App Update Support - When is it being pushed to devices?

At Google IO, they announced the Google Play feature, Smart App Updates, which for Android 2.3+ will only send parts of the apk to be downloaded (no developer interaction needed)
android-developers.blogspot.com/2012/06/introducing-android-41-jelly-bean.html

Has anyone seen this working?  What version of the play store are you using.  I have version 3.7.13 and I do not appear to support it.

Regards,

Matt Insko

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