I saw mixed results on that. Originally the word was that all bikes had a $5k bounty. Later we heard that XB12s got $3k and XB9s got $2k. It was never very clear and different depending on who you asked.
I hesitated until this year before I started calling around and was told that only liquid cooled Buells got $5k and the rest got varying amounts of lesser rebates. There was no consistency to it and I got the distinct impression that the dealers were simply trying to maximize profit despite not really caring about the bikes.
I did eventually find a used XB12XT w/ 300 miles on it. The owner had purchased it in late 2009 with a $5k discount, I know this for a fact.
I love the bike but I certainly would keep shopping until you find what you want for the right price. Given the parts shortage it's only worth getting one of these if you can get a great deal.