Ok so it hasn't been decided if we can add characters to be in our party...
But technically, if someone was desperate they could simply make an NPC that would follow the protagonist(there's a nice word for ya') around and heal them or whatever, implementing complex AI scripts. You couldn't "control" the NPC, but it would still be in your party. We can add NPC's after all.
Another thing, say you have an arrow flying towards you. If you have been enchanted with some sort of fast movement, or already move fast enough, and you move aside, will the arrow move to follow you like in Baldur's Gate and Warcraft2 or will it fall harmlessly to the ground, like in Myth TFL or Soulblighter? Can we make it do one or the other? Because I am sick of having my hasted wizards dodge to the side only to have the arrow TURN and follow them.
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"How can you hope to command them? They are the Ikthey, they do not submit,"
--Talia, speaking to Wilanthor