Better integration of naval elements. The role of battlefleets is something most stories and games seem to regard as entirely seperate from ground conflicts, and it would be good to see a combined use alongside the Imperial Guard.
Plus the one time they were involved to any degree was in Soulstorm, a decision forced upon the dev team and on an engine never designed to account for fliers' presence.

Something like Supreme Commander 1 with Titans and stuff would be badass.

I think Supreme Commander style would kill Wh40k...... Marines are too insignifcant and everybody just would spam Land Raiders and Thunderhawks......

I'm with you on this, i don't like basebuilding at all for a 40k game.

I'm talking about Landraiders and predators being the SMALL tier tanks.

It would be nice to get back to base construction like in DOW 1 and customization and RPG aspect to remain as the DOW 2, plus DOW 1 and DOW 2 have a good story and a good story development. I personally prefer DOW 2 story although they can perhaps to focus the story of another chapter for DOW 3

Yup, I think it doesn't fit at all. Also, DoW II had some tactical feeling that made me like it a lot, altough it can be improved... A lot.

I do not really know, as long as they can make it fun and expand on the elements of 40k i would be happy, a good story and immersion into it really make sup for a good game.

But i wish to see a different aspect to it all an different immersion, a story to be told from different views, i am not sure truth to be told.

........ Then I really hope that game never gets developed lol

Things I'd like to see in the next DOW (DOW III)

1. More Cut scenes pls!
2. Space Battles.
3. More aircrafts.
4. Being able to build walls/fortifications.
5. skitariis, Battle servitors and a Magos as a hero unit.