I traded my 04 in at least in part because of gas tank concerns- mine had swelled to where removal had become a major PITA. My first plan was to get Ducati to get me a new tank (my understanding from the dealer was that if the tank exceeded certain dimensions, DNA would give you a new tank for free) then use the Caswell sealer
Caswell Inc. - Epoxy Gas Tank Sealer which is supposed to "ethanol-proof" the plastic tank.
I made the mistake of test riding the 1200, and my dealer gave me an awesome trade-in, so I thought I was home free. Now it seems there is some potential issue with the 1200 tank as well!!!
My suggestion is what I'm going to do for myself- take the lawsuit extended warranty, and if I need a new tank, Caswell coat it before it's installed. As always, YMMV...