The blocks are a neat idea, and possibly not far-fetched. Apple already has at least one "live" icon - the clock app tells the correct time down to the second.

My personal wish list:

  - customizable url scheme handlers (e.g. set Google Maps the default map app)
  - API for communication between apps
  - API for Siri
  - API for live icons
  - User profiles for iPad
  - Fingerprint reader for iPad (this plus profiles would be awesome!)
  - Biometric API - fingerprint and/or facial features
  - split-screen multitasking