I wouldn't mind a change of race, but adding in the six major races would be a pain to code. I would love to play as an Elf in the Divinity games or as a Dwarf. However, I don't expect that it will happen in the near future.
I do think that they should carry on with the Dragon Knights now that they have been exonerated of the crime they were accused of, and show the rebuilding of the order. I have no doubt that the Dragon Knights would be needed in the upcoming battle against Damien.
To that note we know that the Divine is incapable of killing Damien (he has failed to do so twice, even against hs better judgement) and the Dragon Knight of Divinity 2 is the most senior Dragon Knight remaining (that we know of). This does leave an opening for one of his/her disciples to take up the mantle to try and bring Damien down once and for all.
Alternatively we could see another co-op game with the Divine and the Dragon Knight both being playable characters in the upcoming battle, where you have to, once more, gather all the races together to thwart Damien and rebuild the order of Dragon Knights (this could lead into the induction of all the races having a Dragon Knight representative as well as them all having a seat on the Council of Seven). In doing so this could open some old areas as well as some new ones, we've seen the Dwarven Halls, but we haven't really seen much of the other non-human races' 'capital' settlements so far.
