90% huh? I'd like to see those statistics. Oh, and since you guarantee your statement, what's my compensation if you're wrong?
As people dig through the current version of OS 4, they are finding things not mentioned in the keynote. For example: iChat. It's still not clear that iChat is going to be on the phone, but there is an iChat service running in OS 4. If iChat is planned for the final version of OS 4, wouldn't that be bigger news than iBooks? And yet, iChat wasn't mentioned in the keynote. Odd how that works, huh?
You might not think iBooks is a big deal, but I do. I have been trying to figure out which reader software I was going to concentrate on, and with the announcement of iBooks for the iPhone (including syncing), I'm sold. iBooks is my reader of choice now. I guess that puts me squarely in the 10% category of your little "survey." Or maybe I'm an irregular iPhone user?
Besides, consider this: Apple may be developing a changed notification system but it's not ready. Maybe it's not even close enough to ready to show at a preview event. If they show it now, and then something goes wrong (remember the fuss over push notifications), people are going to call for the developer's heads on a stick. Why would they put themselves through that again?
But then, so many people here and on other websites seem to desperately want to forget that what we saw yesterday was just a preview. Nothing more. What people have on their devices now is just an early build of OS 4. Things are bound to change before summer. Things are bound to be added, tweaked, or even removed. It's the nature of software development.