My first thought, coming off the EU, is "tone it down, for goodness' sake!". The series is always at its weakest when Force users (or rather, force use) comes to the forefront; there's a reason it's not "Jedi Wars". A self-regulating (or is it?) order of battle wizards with an unclear and shifting role in government as an element of an interplanetary power struggle is (if done well) interesting. A Starkiller vs Luke Skywalker battle would just be another superhero movie. We're not exactly running short of those at the moment.
One high-power approach that I think could work, however, is to put in absurdly powerful Force users- and actually have them struggle against their limitations. We saw in episode one that two droidekas could essentially lock a pair of Jedi down- but they are, most likely, a weapon specifically made with that purpose in mind. You may be so skilled with Force use that you feel you could take on a mid-level god, but all the time you spent honing those skills means that in the midst of a pitched battle that happens to take place in Ysalamiri breeding grounds, you'd be reduced to slap-fighting your enemies. On a more serious note, Atton Rand from KOTOR 2 brings us another interesting (and probably more realistic) idea: normal non-sensitives who were trained and equipped to hunt and kill Jedi. You get some training to resist mental compulsion techniques, but on the whole, it's simple equipment and preparation against skill and training with the Force (you can deflect blaster bolts, sure, but let's see how you do against a flamethrower)- and there's probably several interesting stories in that alone.
It's hard to hold a balance between making these space wizards feel powerful and threatening and dividing the entire universe into those who're "Force Masters" and those who're "beneath all notice". I hope Disney manages to pull it off.
