A class combining fusilier, blacksmith and alchemy in one character alone would be in my interests. Crafting/alchemy could be used to develop different kind of ammunition, (useful) devices, traps and bombs.
Since the souls seem to be clearly at the center of the story, I guess there will be a (dark) mage class specialising in harnessing the power of the souls for the greater good/evil. This class could be one of the most powerful mage classes in the game, but for having such a companion in the party or as a PC, it would also bring penalties in the long run when dealing with many of the world's NPCs.
Also I'd like having a mage-knight that doesn't actually suck, as in most games they seem to be never as good (=useful) than pure warriors/knights or mages.