According to Forefront UAG team blog, UAG 2010 Service Pack 3 is in progress and should be available in the first quarter of 2013. Additional information are provided by a recent Ben Ari blog post.

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According to ben Ari, support for Windows 8 clients connecting to a UAG 2010 SP3 in DirectAccess will be for SP3.

--> Please see the rest on Benoit's Blog : http://danstoncloud.com/blogs/simplebydesign/archive/2012/12/02/uag-2010-sp3-for-2013-what-to-expect-for-directaccess.aspx