You can read the extended warranty coverage on Kawasaki's web page. As I remember, it is only one page long and there are not many exclusions.
Some folks have had rotors replaced under the extended warranty I believe. If my rotors warp again I expect the extended warranty to cover them unless they are worn below the min. thickness spec..
Brian
I have my '08 and, being Germany, the bike came with a 2 year warranty from Kawasaki, extended to 4 also from Kawasaki. I know in other countries is 3 years total, or sometimes even less. Anyway, my front rotors will be changed in the next service at no cost. Last time I visited the dealer they told me that they were a bit warped and were going to be changed (at Kawasaki's cost) by the new rotors ('11 models).
Hope it helps.