Picked this up on TV München news last night, and later in the SZ.
Basically the head of the KVR, has expressed his concern about the large amount of people on the oktoberfest ground during the weekends of last years oktoberfest. Police, Firefighters and emergency medical teams had huge problems getting through the crowds to deal with situations.
"I tremble during the Wiesen weekends, it forces a sweat on my forehead. We've had a lot of luck that nothing really bad has happened" - Mayor Christian Ude (loosely translated by me)
The basic proposal is that the tents will be shifted to the outside of the site, making a bigger space on Wirtsbudenstraße (that central str). More details can be found in the SZ article linked about.
Changes will not be started until at least 2006, and all tent owners have to agree!