Scott just updated his website with two pieces of the FNaF World OST. I have to say, they're both very nice on the ears (Though I imagine the first may get repetitive after a while of hearing it, heh heh)
Something to note about this is the "Ice Cave Theme". This confirms that we'll be exploring locations outside of Freddy's, which I'm very happy about. The theme also reminds me of Final Fantasy IX's Ice Cavern, which is pretty similar in both concept and kinda sorta music composion.
Anyway, link for those who are lazy: http://www.scottgames.com/