Interesting tidbits of a teaser. Thank you for this.
I am really worried though by the suggestion of the various optiosn available as playable. Balance between lore and playable campaigns is a make or break in cases like this (a Space Marine, a Sister of Battle, an Eldar and an Imperial Trooper in the same party might be fun as a joke when they walk in a Hive City's tavern, but I cannto see a campaign working with them). It needs to be clarified whether the game will maintain the power balance realistic between them and explain to referees what can and cannot be matched together unless the players are ready to play different power levels in the same campaign.