I think they've positioned him to probably be Pact of the Blade, but given the art for him on the loading screens, I'm guessing he's locked into being Fiend pact? I think him being a hexblade would make sense, but we don't know (or I at least haven't seen) that Larian is going to add content from Xanathar's Guide to Everything in, so we may not even get hexblade anyway. It is pretty weird that you can't really talk to him about being a warlock even though you know immediately as a player that he is one. Just creates an odd disconnect.
