SyFy's schedule is listing Smackdown's move to Thursday for October 2nd. You can check out their schedule by clicking here. WWE had previously denied that it was the case although they did acknowledge that there were discussions about moving the show. When asked a few months back their response was that Smackdown is "currently" airing on Friday nights, so this must have been something done as part of the new TV deal that they worked out.
As noted a couple of weeks ago, word leaked out about Smackdown's move to Thursday when WWE redid their television trucks and they listed Smackdown for Thursdays at 8pm. It will be interesting to see how they hold up in the ratings when NFL Thursday Night Football begins airing on CBS.