As the title says you can access the first chapter at tor.com right now. There is a bunch of other great news as well. check out http://www.dragonmount.com/News/.
Also, Memory of Light release has been moved up to October 27.
For those not on Tor's email list, the prologue is now avail to buy from them AND now the 2nd chapter is up on audio for you to listen to free if your a member of tor.