The info on Inquisitor companions was given last year when the press got a hands-on with Consular and Inquisitor shortly before they announced the classes. I know Inquisitors will have a Dashade companion who is a melee-type with a sword, plus Inquisitors will have their own apprentice, a Kaleesh (Grevious' species) Sith Warrior. Those were only 2 we were told about, but they give us an idea. I'd have to find a link somewhere to DarthHater's hands-on.
"Sir,we are beginning our search for these rumored 'underwater villages'.They will not stay hidden for long". -Battle Droid Commander OOM-9!