According to GrubGrade, The Crunchy Chicken Enchilada Melt has been spotted in Central Florida as well as Seattle. Commenters on the blog have also reported seeing the sandwich in Milwaukee, Richmond, and New Hampshire (I haven't seen it at any of my local Subway stores here in Southern California, but will keep an eye out).
Adding chips into their burritos has worked out pretty well for Taco Bell and it looks like Subway trying the same.
If you'd like to see more, here's a television commercial for the Crunchy Chicken Enchilada Melt:
