"Beta" for gmail was different. "Beta" for Minecraft means just that. The 1.8 update is suppose to completely change the direction of the game adding adventure and NPCs.
My fear is this is because of the 3 million beta users and grand views of the masses.
Not really. Giving the game some sort of (optional) goal (i.e. actually turning Minecraft into a game) was always Notch’s plan. Nothing special about that.
I guess my main point is that 3 million users might not be the best for a beta game. It might work in the end, but I think Minecraft might get bogged down with 3 million users making suggestions to a non-complete game.