I personally hope theirs more RPG elements in JA. The more the better for me.
And I also hope there's more non combative NPCs in JA than in JO, but more importantly, I hope there's more variety.
But then again, it just depends on the level. I personally like the feel of a level where you know that it's just you, and a 1000 enemies trying to kill you. I hope they don't go over board and stash NPC prisoners, friendly soldiers, ect into every level (not that they have in the past).