Apple definitely did an excellent job of keeping a lid on the HDR addition to iOS 4.1. Many people seem to be thinking they're doing a bad job of letting new product info leak early, but I think this shows they are still doing a good job. I'm also really excited to see how well this feature works on my 3GS as well.

I have the Camera + app as well, and it works pretty well for me.

As far as Tap Tap Tap sneaking in that easter egg with using the volume buttons as activating the shutter, that was flat out a bad decision. They are not stupid people, and I'm sure they knew Apple would catch a whiff of this and pull the app from the app store. Considering the amount of revenue they pulled in (which is still not confirmed), they should have submitted an update to get it back into the store. There hasn't been any information on whether or not they plan on doing this, but I'm hopeful.