Thank you for asking this question.
The latest version (at present Q2 2014 SP1) is still using the 1.9.1 version of jQuery.
We are planning to upgrade to 1.11.1 for the Q3 2014 release that is scheduled for late October.
As for keeping up with their releases - only as long as they support the browsers we need to support like IE7 and IE8, which makes the jQuery v2 unsuitable for our suite.
I hope this clears thing up.
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