Welcome to Gaia! ::

I'm fine with four, I'd rather not have more that 5-6, but I'll be sorely disappointed if it only has two.

Anyone watch the short and worthless game play montage that ended in a cool Imperium catchphrase?
Also: Booty!

"I guess there's always a chance they could make an appearance"
What do you supposed that means?

Methinks 50-50, maybe they make a cameo at the end of the game like the Necrons did in Winter Assault, or they wont be in it at all.

Trouble is they have no sentience, so how can you grow close to them? Like pets?

Maybe you can gain certain bio-mods or upgrades such as the lash-whip etc. for your characters. Orrrr you can create your own biomorphs and graft these onto your models, making them your own over time?

Yes they will most likely do that. I know for certain that they are going to start from scratch. Not only because of the new engine but also because hello? A whole new gaming concept is being used for the game, no more base building? More focus on squads of persistent troops throughout the entire campaign? I'm certain some units will go.

For all I care they go back to the basics of a marine force: scouts, tactical marines, assault marines and terminators. Add in the Predator and Dreadnought, done! Sprinkle on top two or three commander units such as the force commander, a librarian and maybe a chaplain and what more do you need? Maybe the Whirlwind to showcase the destructible terrain under fire and if you've been really nice a Land Raider.

As long as they keep air units out of this, they were not meant for Dawn of War. The Grey Knights were an attack on the established fluff anyway, so with them removed from the marines we have a more fluff-correct force.