I'd personally like it to be about a gang of Jedi during the great purges. They're fleeing Vader and trying to survive in an increasingly hostile universe, while the trappings of their faith fall apart around them. They succumb to temptation, hate, fear and even betray one another in a desperate scramble for survival. Of course, they'd also be a team for much of the series until a dramatic conclusion in which they all must die at the hands of Vader. Think Blake 7.

It might even give those unimportant Jedi that just stood around in the background in the prequels some, y'know, purpose.