AHAHA never thought of them like that

I love the guard because they are almost always the first one's to respond to any sort of attack on the imperium, besides who wouldn't love to see a platoon sized element of guardsmen running alongside a hellhound or leman russ battle tank.

Necrons!

tau empire is great, makes more teamwork later on, since there units are specialized.

How emperial guardian can be release ?He weakness maybe he controlls party as 3 or 4 people in squad as 1 character?Tau a don't know?is boring.Necron was interesting and dark eldar too.

Squats! oh, not on list

I think lore wise only Tau, dark eldar and necrons would fit, right? Most others would be allied to the space marines and therefore wouldn't fight against them.

I know, I know, in dawn of war xpacs we had that but it doesn't make much sense... Still would be cool having battle sisters.

Wasnt there like an overwhelming call for Tau race like a year ago? ...or was it Necrons?

Don't say that.

If I were to guess, I think Dark Eldar would actually be the most likely 5th faction to enter the game. Think about it. It's pretty much the only faction that already have the base models in the game from Eldar, thereby saving a lot of production time. They're the perfect counterpoint to Eldar, like CSM to LSM, and on top of that they're well defined and within reasonable power levels of the other factions.

Imperial Guard is a mass numbers faction, after all, like the tyranids. They're probably the least likely faction to get added.

Daemons.

That way the likelihood of Chaos taking Arkhona is doubled.