As far as the Coulson thing. Sure, he is a good character but the Marvel Universe has hundreds and hundreds of characters(and suit variants). Coulson is just a guy in a suit, sure for fans like us he's a big thing but kids love Iron Man and this is a kid's game so in having another Iron Man figure, Lego gets to appeal to the kids who like Iron Man AND the adults who like Iron Man whereas a Coulson really won't be appealing to most people.
Personally, I'd prefer a character like Shocker or Mysterio, maybe even someone like Blackbolt. Actually, when the last game came out they released Iron Patriot which if I remember right was around Iron Man 3 so at least it would make sense. If I was in charge, I would release a classic Hank Pym Ant-Man suit. That way they could connect to fans of the movie. And he is my second favorite character so I'm a little biased!