Share this article The Key Lime Pie flavor follows the Apple Pie take released last summer and the Pumpkin Pie flavor released in the fall. Undoubtedly not the first desired combination that comes to mind, the new option features the same crisp wafer layer coated in a bright green creme. The key lime pie flavored-creme can only be described as a creamy mix of tart sweetness. Key Lime Pie KitKat is available in supermarkets, grocery stores and other retail locations nationwide for a limited time only.