I can't be positive, but do you suppose "flavors" could potentially mean different colors? You can purchase different colored glass as replacement parts. Those are usually made by a different entity.
"Apple tells us in their patent background that corundum is a crystalline form of aluminum oxide and is found in various different colors, most of which are generally referred to as sapphire." From the second article.
Also to note...in the first article, look who the patents were issued to for the idea of strengthening the glass. Rudolf Beckmann, an employee of Manz. It says that those patents may have been acquired by Apple.