I've heard about this promotion via a GDC talk the two promoters of the bundle gave. The talk isn't that pertinent, but it seems to point a pattern. The more the promotion comes to its deadline, the more games and stuff are added (like the two bundle for the price of one).
As you said, they already added another game to the bundle.
8 Days to go, the million is almost obtained, I guess they will have another nice sum to offer to charity on this promotion.
Considering the games, I'm personnaly not that attracted to them. I've tried hammerfall (awesome game, but very difficult imo).
The others game don't appeal much to me, and I haven't been able to connect to steel storm's website and see what type of game it is. Guess their server suffered from sudden glory thanks to/because of the bundle.