REMINDER THESE ALL CAME FROM CONVERSATIONS!! DO NOT TAKE THEM AS 100% FACT UNTIL A DEV CONFIRMS EVERYTHING
-You can only kill companions that are a part of your main story arc.
-When you try to push an enemy off a cliff if the enemy isn't weak enough they will not be pushed off(In regards to PVE, it is a finishing move in PVE so they have to be a little weak, the way it sounded this isn't confirmed either way and there are some questions to looting the mob and what not).
-Mouseover casting is something that may be in, or being worked on(I had to ask, I might be healing!)
-You have affection points for your companions, Even if their personality disagrees with yours if you agree on certain things they will still like you. With that said each companion has a different personality, not so much light or dark side. The example given was Vette will feel bad if you torture the unfortunate but finds it funny when you pick on powerful/rich people.
-The writing for the launch version of the game(Story wise) is completely done. DE works as a jack of all trades helping everyone try to finish their stuff.
-This game is the biggest Star wars project ever made, what they say is canon IS canon!!!
-Like in KOTOR if your companion disagrees with your actions they can call you out for it causing some tension
-Drew Karpyshyn is working on the project, part time(Great news for everyone, even if you do not know it!)