I wouldn't worry to much about the surface 2. 8.1 has been built for it so there shouldn't be any battery issues like I'm having. Hopefully there will be a firmware update on the 18th for the RT that fixes the battery problem.
No, I meant that if after getting the 8.1 update there is an degradation of the battery issue on the Surface RT, then I would have to think about buying the Surface2. As things stand, I am quite happy with how the Surface RT is behaving at the moment - though I am eagerly looking forward to the optimizations of 8.1 that I think will come with it. My plan was to buy the Surface 2 sometime around March-April next year. But if 8.1 degrades the battery of the original Surface, then I'd probably look to get the SUrface 2 in Nov. this year.
Edit: Is there any place where I can find a detailed review of 8.1RT which describes how this update is optimized for the Surface RT - both in terms of performance and battery life? Or, is it too early to look for such things?