I don't find it disappointing, It is something Apple decided to do, I'm sure the marketing department at Apple is a lot smarter than people give them credit for.. After all it is actually a relatively bad strategy to release all of your greatest innovations all at once (in my opinion). I'm 100% positive that Apple has quite a few more tricks up their sleeve, They are just waiting for the appropriate time to reveal/release them.
I felt the same way about the 3G-to-3GS launch. I'm content with my Android device, but I will be keeping an eye on the future of iOS. Either way, I don't buy things just because they are new, I buy things that work for me.