Tickets for the Labor Day edition of WWE Monday night RAW have a 6:30 PM starting time. This is earlier than usual, which may indicate that the WWE will be doing a three-hour show that night. It has not been confirmed at this time. This will be the final Monday before Monday Night Football begins. There is no listing for a SmackDown taping on September 4th, so it could end up being a double taping.
UPDATE: According to a source, starting on July 2nd, WWE RAW events will start 90 minutes prior to the live show. The Labor Day edition may end up not being a three-hour show. At this time, it is not confirmed if WWE is adding something to the RAW tapings or perhaps moving NXT tapings to Mondays.
UPDATE x2: Prowrestlingevents.tk confirms that WWE is changing the start time of their Monday night tapings. Beginning July 2nd, many of the Monday tapings will start 90 minutes before the live RAW broadcast. Currently, the tapings begin 30 or 45 minutes before RAW. No word yet on why WWE is extending the Monday tapings.