The post ( http://jetpack.me/2014/04/10/jetpack-security-update/ ) says clearly that this update was rolled out via "core auto update functionality" - where possible. So it updated automatically in the background, just like for core with 3.8.2!

I just got this confirmed via Twitter conversation with other WP developers.

Great!

Only little "issue": the info about that was maybe a bit late, updates were already rolling out and sites were automatically updated before webmasters/ maintainers got know what was going on.

However, in the end, it's great to see, another security issue got fixed very fast!

I, personally, love the auto background updates. I had no problems since 3.7 -- on a bout 100 installs. So props to @Nacin & the whole team for all this work!!!