Microsoft officially announced couple of days ago that UAG 2010 SP3 will be released the first quarter of 2013. This new Service pack will provide support for Windows 8 and IE 10 as well as other applications as Exchange 2013, Sharepoint 2013………etc
The support of DirectAccess clients running Windows 8 as well as the normal Service pack fixes and improvements are expected.
Looking forward to getting the new Service pack and testing it with Windows 8.
Update: Microsoft UAG SP3 is released on Feb 2013 and can be downloaded from http://www.microsoft.com/en-eg/download/details.aspx?id=36788
Also UAG SP3 Rollup 1 which is released to fix several issues with SP3 is released on April 2013 (Need SP3 to be already installed) and can be downloaded from http://support.microsoft.com/kb/2827350