yeah the new controllers offer:
-General Duke Shape with Controller-S size and XYAB button layout
-Lighter than an S (Even with the battery pack)
-Integrated communicator (just plug in a head set and go)
-"Xbox Guide" button that will take you to the Xbox Live Dash at anytime (it can also function as a power button for the console)
-LED indicators to tell you which player number you are.
-LED indicators to tell you when your batteries are low or if you have a new message in your in box.
-Adjustable Rumble "volume" Off-Low-Medium-Full
-Start and Back buttons have been relocated to the center of the controller
-Black and White buttons have been removed
-Shoulder buttons have been added directly above the trigger buttons.
-Capable of functioning as an interface device on a windows (longhorn?) PC
-No more break away cable
-Wired controller use USB2.0 with standard USB shaped plugs (NOT Xbox shaped plugs)
-Wired Controllers feature a 3m cable. Wireless controller feature a 10m range (NOT line of sight)
-Up to 4 wireless controllers can be use on a single console at a time
-It is unknown how many wired controllers may be used at a time (there are 3 USB ports and the console has the ability to utilize USB hubs as well)
You can see it here: http://gear.ign.com/articles/616/616895p1.html
or on the official xbox360 website: http://www.xbox360.com