A portion of a TVG interview with Senior Producer Amir Rahimi...

TVG: Obviously a lot was made of Steven Spielberg's involvement in the first game - our very own editor referred to the original Boom Blox as "Certainly more Animaniacs than Schindler's List" - but now that the concept is out there, has Spielberg taken a back-seat on the production of this sequel?

AR: Coming out of the original Boom Blox we didn't know what to expect for the sequel but we've found that, even before the original version hit the shelves, there was so much enthusiasm and passion for the game from Steven Spielberg as well as the dev team that we couldn't help but to start working on the sequel before there even was one; before they'd been any money spent on it.

The conversations; the brainstorming; the development just kept going. It almost didn't even stop. That's sort of testament to a) how fun the game is, but also b) how passionate and awesome the developers are, so he stayed very involved on the sequel to the point where, even when Spielberg was on vacation over the summer (after Boom Blox and Indiana Jones: The Crystal Skull), he would video conference in with us and check-in because he wanted to see how things were going. That's how involved he was in the process and he still shared plenty of awesome ideas that we've implemented.

Full interview here