Who cares about story campaigns? Nobody plays them anyway. People just play sandbox.
One of my only bad thoughts about the game is that there should be more campaign. 'People' will vary in what game mode they enjoy most. Of course I realise people are getting SUPER angsty about that one comment but come on, they're custom levels packed with interactivity and lore, that just rules.
Anyway, good interview and I really wonder what GC3 will look and feel like in a while...