I will keep this first post quite short and just present some initial thoughts about a Warhammer 40k MMO.
So what should be considered, when developing the game? First of all: what races to choose. Warhammer Online: Age of Reckoning (WAR) has choosen the approach of selecting 6 races and putting 3 each into some form of alliance. While the Empire is allied with the Dwarves and also with the High Elves ... well Dwarves hate High Elves to the blood. Nevertheless they are in the same 'faction' or 'realm' (referring to the Realm vs. Realm (RVR) nature of the game).
Taking a look at the other realm reveals an alliance of Dark Elves, Chaos worshippers and Greenskins. If anyone would ask me: that's nonsense. These 3 would just as well kill each other as well as their enemy faction.
So what to learn of this? A Warhammer 40k MMO should not do this at all. There is only one 'alliance' in Warhammer 40k and this is the Empire. Well ... at least most of the time they kind of work together. This includes the Imperial Army/Navy, the various branches of the Inqusition which also inlude more or less the Grey Knights and the Adepta Sororitas and partly also the Space Marines wich are also the last part of the alliance and likely also the most popular army in W40k at the moment. So there is the Empire ... Orcs, Eldar, Dark Eldar, Tau, Tyranids, Necrons and Chaos. Well, to be ture, most of them feature internal conflicts as well as the Empire. But this could form a basic list for factions in the game. All of them fight against everyone else. So if one doesn't want to press them into some kind of greater alliance that's what the game should feature as slectable 'races'. To be honest - I don't belive this will happen. No developer will design so many different factions and try to balance them. But as long as there are no further infos about the game actually in development, I will use this as a base for my thoughts.
Furthermore, I think this game should focus on PvP. Anything else wouldn't fit the Warhammer universe well. But as I see the necessities of the market, it would likely also have to feature some kind of PvE.
As I'm out of time for now, this concludes my first post. In the furure I will write about the kind of characters, pepole should be able to play, about PvE elements, the alternatives for settings and camnpaigns and about the server-structure and size to use.
Hope you drop by to read ;)