Agree with your points. Also:
* No soft or hard level locked areas. If something is difficult, you should be able to use all the tools at your disposal: wands, scrolls, potions, to surmount it even if it's still slanted against you. Also it is quite nice having a dragon cave in an area surrounded by orcs and other stuff. You may poke in, see it, and decide to leave it for later, this makes the game feel a bit more 'open world', in the sense that you may want to return rather than the D:OS2 formula of moving through an area mopping up and never going back to it.
* More open world mechanics, quests that bring you back to previous areas, etc.
* Random encounters (a big deal in tabletop too)
* More than 4 party members (think it's confirmed there will be more, but just want to throw this out there just in case)
What should stay from D:OS2 and/or be improved:
* Modding tools, and the DM mode (except with toggling on/off tadpole mechanics to give a much more pure tabletop DM mode or something that abides to the core ruleset).
That's all I've got for now.