Definitely will be looking to get Bulk and maybe Scorpio. Might get Stringer on clearance or just bricklink his mask.
Though I may just use the "Design by Me" hero factory store to get pieces though if its got the colors I want.
But you're right, the new system is ingenious.
What do you mean by "action"? Do you mean "oh-look-I-cut-the-cable-and-the-chandelier-fell-on-you" action? Or transformers explosions, FF advent children sword fights, Fearless hand-to-hand combat action? Believe me, there is a difference.
Wow! Is there a brickshelf gallery or something that has pictures of the prototypes? I would love to see them! I've always loved seeing what the models looked like before they were finalized! And believe me I would take them if I could.