I would return the Touch and see what they announce. Most are guessing it will be a Touch with built in light ala the Nook Glowlight. Some rumors say a higher resolution screen too.
As others have pointed out, a Sept. 6 announcement doesn't mean we'll see the new Kindles immediately. Probably a safe bet they will all be out before holiday shopping season in December though.
I will be paying attention, pre-ordering the new Kindle the moment it goes live on Amazon's site and selling my Touch or giving it to a family memeber.