For the first time ever, a Windows RT build has leaked online. This is the upcoming Windows 8.1 RTM build, 6.3.9600.16384.WINBLUE. Microsoft has already made an announcement that they are rolling out Windows 8.1 to both ARM and x86/x64 PCs in October. If you are so eager to try it out before that, you can download it from torrent sites. As expected, this build comes with Office 2013 pre-installed which will also include new Outlook 2013 RT.
But as always, there is a risk associated with it. So, do at your own risk!
Windows RT 8.1 Build details:
RELEASE DATE: 08/21/2013
OFFICE 2013 RT BUILD: 15.0.4505.1015
SIZE: 2,611,933,184 byte
Surface RT Driver details:
SIZE: 12,230,873 byte
The language packs for both Windows RT 8.1 and Office 2013 also got leaked. You can find download links in the source link below.