Well, I'm not too sure what the current state of the issue is, but...
A rift was created between people who thought JKD should be taught just the way it had been when Lee died ('Original' JKD) and the people who believed that JKD was an evolutionary process that went through continual adaptation (JKD 'Concepts'). Most the of 'Concepts' people seem to have an Inosanto lineage and most of the 'Original' people seem to be either students who trained with Wong or those who trained with Lee but were never certified instructors under him.
The 'Original' JKD people maintain that JKD should be taught just as Lee taught it before his death. In essence, they've made JKD a concrete 'style' which is something that Lee was against. They tend to disapprove of Inosantos's introduction of FMA into JKD, though that was initiated before Lee died. Some of them also seem to forget that Lee had turned the schools over to his instructors, J. Lee, Kimura, and Inosanto, and he rarely trained anymore students near his death, as he was busy making films and also wanted to take the time to train himself.
The 'Concepts' people are of the mindset that JKD is more of a philosophy, or set of concepts, applied to MA training, particularly 'absorb what is useful, reject what is useless, add what is specifically your own', though that is but one of many principles involved in JKD. As such, it is a continually evolving entity, with different interpretations from person to person, as it becomes a personal expression after enough training. However, some people add and discard without fully researching, which is basically the wrong way to go about it. They see something they like, they just add it without a comprehensive study. Likewise, if they don't like something, they reject it without a second thought.
Like I stated earlier, to me, paraphrasing Mas Oyama, 'JKD is JKD!'.
However, since I'm just a pontificating baffoon, I defer to the certified JKD MartialTalk members.
Cthulhu