We don't make it a regular routine to check Asus's website to read what they intend to do with a particular motherboard and it's drivers. But if you wanted to know all you'd have to do is to visit their website, find their Contact Us page and ask them.
I suspect that Windows x64 os would have some support already for your motherboard & it's hardware like Windows XP and it's predacessors did. I take it you have not installed it yet.