ABS - Was an OPTION pre- 2011 (In Europe at least.... My friend's AN400 L0, (so model year 2010) but registered in 2011, does not have ABS.
The 2007 - 2009 machines have the tachometer redline at 8500 RPM, later machines are at just over 9000.
The 07-09 final drive gear ratio is 5.904 , 2010 and up is 6.484.
2007 machines came with a 3 shoe clutch, later ones have five shoes, which can be retro- fitted to earlier bikes.
The major change (2007 and up) was the introduction of the 400cc DOHC setup, with shimmed valve clearances. Previous 385cc engines (2002 - 2006 in USA) are screw and locknut method.
Far simpler to do, but adjustment required much more often - If you follow "the book".
Useful links -
List of all SUZUKI Burgman models and production years
www.autoevolution.com
Probably the biggest Suzuki motorcycle fan site of the world. Thousands of pages with technical information, pictures, magazine adverts and brochure scans of most Suzuki bikes ever sold in different parts of the world. Thousands of bike pictures and stories posted by the readers.
www.suzukicycles.org