Helene Bergeot took a moment during the lunch break of Pro Tour Khans of Tarkir to make what is seemingly a big announcement: Friday Night Magic is changing. If your favorite format is not supported at FNM, never fear, it almost certainly is now:
This is seemingly a huge change for semi-casual Magic moving forward. All of a sudden, your FNM could include Rotisserie Cube Backdraft, or some other sweet, niche format.
However, in practice, I don't think this is going to make much a difference. In my experience, most local game stores are quite set in their ways. Adding Modern as an eligible format for FNM didn't result in any extra opportunities to play Modern in my community. That may not have been the case in yours, but do you really think that an LGS is going to deviate from Standard, Modern, Draft, or Sealed? These are the formats that make your local store money, not Archenemy or Planechase.
At most, I imagine this might add a Commander option to your FNM. But unless you have an absolutely booming community, a risk-taking LGS owner, or a local fanatic for one of these formats, don't count on showing up to your LGS on Friday night to play a Reject Rare Draft. This adds a lot to what is possible at FNM, but in practice, I don't expect it to much impact what actually happens there.