Thanks again for all the comments. Went and bough it last evening and played it for around 3 hours. Sure feels like money well spent.
Those asking about DW:
DW is definetly a 4X compared to AI war which I think as Grand scale RTS with 4X elements (makes me think of supreme commander in space). Which means there's more diplomacy and exploration. Also the game has some nice innovations like splitting the empires to private and state, and reduction of micromanagement by allowing you to automate certain areas of your empire (like the always "interesting" taxes for every planet). I've had empires that had around 100 planets and still could easily control it. That was epic.
It takes some time to get used to UI and the mechanics but it's quite enjoyable even during this learning phase. DWs community is also very helpful and dedicated.
The Demo question is also been asked at DW forums. Currently, there's, unfortunately, no demo. All I can say is that if you like 4X strategy and grand scale RTS, but don't like excessive micromanagement, DWs probably a great choice. Many veterans on the DW forums have played Sword of the Stars, MOO1, 2 & 3, Sins of a Solar Empire, GalCivs and many others and still stated that DW is their reigning champion.
One other think: If you have spare time, I'd recommend that you check some After Action Reports at DW forums War-room section. Those give quite good overview of the game and its mechanics. And many of those are also fun to read too.
DW is currently patched to 1.0.6.0 version which has fixed all the major bugs that riddled it when it was launched. It still has some minor issues but those haven't bothered me or many others. Also the Code Force seems to want make expansion or several to DW due to it's popularity. First one may be released before december.
Sorry for mods for derailing this thread. Just wanted to answer peoples questions.