The most recent Intel chips seem quite interesting for a new Olinuxino :).
http://ark.intel.com/products/codename/46629/Cherry-Trail
I've found two "products" already using these chips:
https://www.indiegogo.com/projects/magicstick-most-powerful-pc-stick-8gb-ram#/ (I know, this is not a SBC)
https://www.kickstarter.com/projects/802007522/up-intel-x5-z8300-board-in-a-raspberry-pi2-form-fa
Wow, they're expensive! That will dramatically reduce the interest.
I hope they don't also demand more power than ARM chips.
John
And another one (but only with Windows):
https://www.kickstarter.com/projects/139108638/lattepanda-a-45-win10-computer-for-everything?ref=category_location