So, as some of you know I have been doing a lot of Windows 8 Windows Store App development for CRM lately. As it turns out, the only way to debug specifically for an ARM device is to debug remotely by direct connection to the ARM device.
The instructions state explicitly that you need the same update version for your remote tools as you have for Visual Studio 2012 which presents a problem when Microsoft fails to release as Update 3 for the remote tools and repoint all of their download links to Update 3, making Update 2 virtually unavailable.
I finally found an ISO installer for Update 2 here: http://blogs.msdn.com/b/visualstudio/archive/2013/05/03/announcing-availability-of-isos-for-visual-studio-updates.aspx
-I hope this helps!