I tried it out yesterday. The Dark Eldar are the only new race to be included in the demo. Here are my initial thoughts:

It definitely is more Dawn of War; which is a good thing in my book. The Dark Eldar are an interesting race to play as. All their units have high damage dealing capabilities and can move rapidly, but are extremely fragile. Their base infantry unit is meele only (Mandrakes I believe), but has a damage output higher than Space Marines.

The new resource for them, soul essence, seems like a half baked idea at this time. When I initially read about it I thought that the Dark Eldar would need to go on the offensive, kill the enemies, and then harvest the souls. The need to go out and attack the enemy would help offset the balance of having the option of activating special abilities (that do not require a specific unit in the area to use) that can wreck havoc. Instead, the Dark Eldar can upgrade existing buildings to produce dead bodies and harvest the souls from them. This means that the Dark Eldar can simply hang back in their base and collect soul essence to charge up their abilities. How effective these abilities are compared to other races has yet to be seen.

Two things that really stood out like a sore thumb for me was the new intro video and the voice acting. The intro video felt weak and lacked the intensity that the other two have had. The voice acting for the Dark Eldar feels flat and corny compared to the other races. I heard the new Space Marine captain's voice and was not impressed (granted, I was not impressed with the Dark Crusade version either).

Sadly, you can very much tell that this game was made by a different developer. Some of that awesome, intense atmosphere that Relic created seems to have diminished. I am possibly being a bit overly sensitive here, so take all of this with a grain of salt as I am a huge fan boy of the series.

Bottom line: It is more Dawn of War which is a good thing. Day one purchase for me regardless of what I have said here.

Nope, this is officially the LAST expansion.

I know it does sound pretty meh but it's actually pretty cool mechanic

I liked the demo and look forward to the full expansion.

Damn I didn't realize it's next week it's being released, Awesome

I hope it's out on steam first day because I would like to buy Dawn of War and all the expansions on steam but if not it's all good.

Not that I know of, but they will be announcing it fairly soon I suspect.

Why, oh why, is this not yet available over Steam?

Assuming I am allowed to purchase this game someday, is anyone interested in playing it online?
I haven't played DOW multiplayer since the first game came out, and I'd love to play on a regular night with some goodjers.

So no one has actually played it yet?

It's up.

I actually decided to skip it when I found out they added air units. I really enjoy the games, but that's one thing I was never sad they left out.

The lack of actual player controlled air units is one of my favorite things about Company of Heroes.

It's ok though. I fully expect a Dawn of War II announcement using the Company of Heroes engine someday, at which point I can get excited about a warhammer game again.

I'll buy it when I get home - does anyone know if the CD versions I own of the other three games will work with the STEAM version of Soulstorm or will I need to go buy the actual disc?

This is actually completely incorrect. Relic has already stated that they'll be handling balance adjustments and patching themselves. Iron Lore was only onboard for the development itself, not the post release support.

The steam page I linked to says it'll work just fine.

Keep in mind that steam won't add and store your old codes for your other Dawn of War expansions. I tried it with COH and it was a no go. There is only a list of around 15 games where they accept disc CD keys. Basically if you change computers you will only be able to download the expansions that you purchased off steam. Just a warning to not throw away those discs yet!

So who sucks at this game and wants to get good?

That may be too much of a hassle - I will probably just pick up the CD version so I dont have any issues. I found that patches became problematic with having a CD version and a STEAM purchased game in the past as well.