Tim,
How am I supposed to get my RAW format pictures on there from my DSLR while I'm on vacation? Since you guys abandoned Aperture, how can I run Lightroom on it? How can I sync all that stuff with my Mac at home?
How am I going to edit on it?
Those are the reasons I ditched my iPad and went with a Macbook Air. Many of us want/need the full functionality of a good laptop.
Just to let you know - yes you can invest and edit raw from your DSLR on an iPad... I personally do my bulk edits and selects on the pad and then do the finals on my laptop. For me it's not close to a replacement BUT it does ADD a ton of flexibility to my photo-life. I can leave only the workhorse desktop at home and only cary a pad. Having a faster speed and a 12.9 inch format - it will make my photo selecting process immensely more enjoyable.