That is a good question. If I remember right all of the 5.3L GMT-900's should have it along with the Impala 3.9L and 5.3L. as for the rest I really don't think they'll get much of anything in the 2009 model year. GM may be waiting for the next gen of the current models to implement E85 Flex Fuel tech into the rest of the line up. Good question though.
I do know that there is a company in Boulder, CO that sells conversion kits for any car 1985 and newer. They even converted a motorcycle to run off of E85. The are called Flextek. Sounds very legitimate. It would cost me about $550 to convert my Suburban to E85 and about $350 to convert my Ion to E85. With the rise of gas prices it may be worth the conversion, it only depends on how much the price of E85 goes up. Anyone know what to expect the price of E85 to be this summer?