Dear Tim Cook,
Reasonable innovations I would like to see in the next iPad:
-an optional active stylus. The iPad just begs to replace paper but handwriting support means I still pick up pen and paper when I need to write quickly
-laptop like bluetooth keyboard support. There are great 3rd party keyboards for the iPad but software is holding back the experience. Apple can improve that software (full navigation via arrow keys please!) without increasingly complexity at all for anyone who doesn't use their iPad with a keyboard.
-file support. Hopefully iOS8 is almost there. Cloud drive if it is supported right, particularly by third party software, could greatly relieve the file management issues. I should always be able to keep ONE copy of a file in a central location (not within an app) and be able to access it from my iPad and macbook air seamlessly using any app I want.
-dual screen multitasking. Not absolutely necessary but would be nice. I'd frankly be happy with just an easier way to do the multitasking we have right now. Both double clicking a physical home button and doing an awkward four finger swipe don't really cut it for an action I want to do quickly often to switch between apps for work.
-iOS should be optimized for the iPad just like the amazing iOS apps are. 9 apps visible per page on a 9.7inch screen is the height of stupidity and really makes you sound like a hypocrite when you criticize android tablets.
Sincerely,
Your future tech consultant
PS. Please don't limit awesome new productivity features to a new 12" iPad Pro. The iPad Air is a triumph of optimal screen size, weight and dimensions for a portable tablet. Please keep making it better!