Isn't a forum meant to be about sharing ideas? i don't think anyone here is pretending to have any insight into the book and how abilities will pan out. Im sure we'll all be proved wrong and thats half the fun
@Exiled good list but think you need venom to have deadly poisons and poison mastery. So that is three abilities you need.
I've been trying to identify the career ones. Here are my suggestions...
assassin: venom and first strike (or deadly poison?)
shadowstalker: going with the shadow in the title, shadow fury and shadow speed. dark pact also sounds a bit shadowstalkery
pyromancer: burn and ignite (backfire?)
medic: refresh and mend
icelock: ice shards and ice shield
cavalier: shield wall and shield spin
witchfinder: no clue at all! There are some anti-vampire abilities like stake and reflect. perhaps they are witchfinder?
ranger: natures revenge.
inquisitor: i'm going on the paladin and holy theme. cleansing light and martyr perhaps.
I'm not sure on the other careers. Looks like a warlock and some type of elementalist (windblast, swamp legs?)