Maybe the iPad version will come later and they wanted to get the iPhone version out in time for launch.
Interesting to see what if anything M$ does to counter. Everything I've seen and read indicates that Sony has won this generation, but only time will tell.
Without starting a war.
Go check out the xbox youtube channel for some demos and previews on how the system works. It's really impressive. That will give you a better perspective on what each console does for your comparison.