Warning ahead of time – your mileage may vary.
However, my Twitter friend Roman Mueller has put most of today into working on a cobbled together process to get the Windows 8.1 Preview update onto his Surface RT.
He needed/wanted to do this because of the current available languages for the preview update keep him from installing the update through the normal means at http://preview.windows.com.
The process takes 9 steps and based on his recent tweet it seems to have worked.
So if you want to give it a shot – then step right up and check out his post.
Source: 9 Steps To Installing Windows RT 8.1 Preview On Non-English-US Surface RT (Updated!)