I try to steer away from writing about the same subject twice in one day, but I watched the Guitar Hero World Tour video again for a good look at the drums, and I noticed something strange. Lets see if you can spot it in the picture below.
If you haven't figured it out, the two cymbal pads are the same color. This would (logically) mean that you could strike either one for the same effect. So what does this mean? This means that you've got one less pad to worry about, but one extra pad to show off with.
I'm going to have to confirm with Activision that both pads are truly one and the same. The colors are pretty much a dead giveaway, but I'd like to be certain. I'll let you know what I find out.
Update: This is why I hate being colorblind. I can see only a slight color variation between the two cymbals in the video and this picture. I'm really hoping that this won't be an issue when playing the game. However, it has been confirmed that there are only three drum pads and two cymbals, so there's only one extra pad to hit.