False alarm. What's changed is that Flex Fuel is no longer standard in GM trucks. So if you get one without a yellow gas cap, it's not Flex Fuel equipped. Thanks to this forum, when it came up in my store, I actually knew what I was talking about, unlike one of the managers who just made the situation worse when one of our customers just assumed that his truck was Flex Fuel equipped and filled up a whole tank.
Unfortunately, this also means that GM is continuing to nickle and dime their products out of basic features that are a serious bonus for most people. The Regals with the 2.0 Turbo no longer come Flex Fuel capable and the GNX likely won't be, when it comes in 2016 or 17.
Working at GM continually makes me want to go to Detroit and hold a picket sign that says, "WHY YOU DO DIS?"