Krav Maga in La is always trying new stuff, just to see what can be enhanced as far as self-defense goes. As for the teaching across the country, it should be the same. The way an Instructor teaches will vary, but what an Instructor teaches should not. In order to be a Krav Maga Instructor you need to pass a three day test on the material and also a teaching test. Once you have passed your test you are given a training manual. All the manuals are the same, so Krav should be the same where ever you are. As for Instructors they MUST be certified in order to teach Krav Maga. As for updating the system I think I've heard some talk about adding more ground work, which would be nice. As for the other stuff, "If it's not broke, don't fix it".
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If your in a "Fair Fight", your tactics suck.