As of September 30th, 2008, ECW will be moved up one hour to 9:00 EST on Tuesdays. The reported reason is due to the WWE making all of their television programming PG rated.
As we reported here on the site, the planned merger between the Raw and ECW brands has been dropped. This is due to the hectic schedule they already have on Mondays for the Raw tapings. Adding ECW would make it that much harder and more stressful. Additionally, Raw has a lot deeper roster which would not allow ECW superstars as much room on house shows as they do currently with Smackdown.