This is really getting on my nerves with Asus and how behind the curve they are. What you didn't have enough time with all the beta's of 8.1 to make sure it worked? Hell its been out for how long now? Oh RTM was end of August. Since Asus is an IHV you'd have access to the OS then before it went RTM to the public in end of Oct.
So really what is the BS on the delay of anything software wise? I have spent sh!t loads of money on Rampage boards over the years.. and we still get this lag time of working software.