Upgrade RAM in Surface Pro?

I'm going to be in the market soon for a new computer and I have narrowed it down to a Surface Pro or an 11 inch Macbook Air. I can upgrade the RAM on the MBA of course, but I have not been able to find out if the RAM is user replaceable on the Surface Pro. I tried google searches and even on The Verge but cannot find any answers. Is that information just not available yet?