I'm not sure I'd update the official site with everything. It's supposed to convince people to buy the game, not be a strategy guide.
I mean, yes, include information on cards and unit types and unit upgrades, but perhaps not all of them. Leave a little mystery, allow for a few surprises. That kind of thing.
Well, if the multiplayer portion of the game appeals to the mainstream audience (IE more usage thereof), it is better to implement it. I agree that there should be a shred of mystery to easter eggs, ultimate races, ultimate cards, ultimate things or a hint of some sort on the descriptions to the end objective.
Knowing Larian, they could implement this effectively.