Hi Cindy!
Yes, this is a new development. They have decided to change the race to October from September. I think it is mainly due to the high humidity that we experienced in the 2012 race.
I actually spoke with runDisney about this recently. They have not officially chosen a date in October, but plan to in the next few weeks.
As soon as the date is chosen, it will be posted on the
runDisney website. Another great way to keep up-to-date with runDisney is to "Like" them on Facebook, (Run Disney) and follow them on twitter (@rundisney).
You can also contact me anytime on here, and I can check with them directly.
Please let me know if you have any other questions!