Sorry if someone has made this thread already...couldn't find it.
Also I apologize in advance to all the nerds (especially the red-text writing one who builds his own light sabres - which is ok by me)...the following force-using groups might not fit into the timeline without some creative license...
How about the Fallanassi (white current users)?
Witches of Dathomiir?
Sorcerors of Tund?
Grey Jedi, with mixtures of light/dark skills?
WHAT ABOUT NON-FORCE USING GROUPS...Wookies anyone? Hutts? Droids?
Anyhow, please let's speculate. That **** is fun.
I agree with the Witches of Dathomiir as well as Dark Jedis would be cool, they could make it a night ac or something where if your dark side points are high enough you could chose to become sith or a Dark Jedi who uses the Dark Side but does not accept the sith.
They should also make a class that primarily uses electrostafs/ viroblades cause there are a lot of them weapons kicking around but the are not really significant at the moment.