They are working on an ASTM-certified automotive gasoline approval program for some (many?) of their existing 4 cylinder models, but this has nothing to do with new products. They are also working on an engine with advanced spark and fuel control called the iE2. This engine might be the answer to flex fuel purposes, but as of now it only exists in a six-cylinder turbo configuration. I am not aware of a flex fuel engine, per se. I believe they consider it too expensive to develop one. Even the iE2 is largely derivative from the IO-540. No doubt a clean-sheet flex-fuel engine could be made by someone, but as always the problem is paying for it.

iE2, etc.