I dunno if you can categorically rule out portable form factors for "content creation," though. Content creation is a biiiig space.

I used to be quite productive writing on the road using a Handspring Visor Deluxe (more info for the young 'uns among you: http://en.wikipedia.org/wiki/Handspring_%28company%29#Visor_...) with WordSmith (http://danbricklin.com/log/wordsmithreview.htm) and a Stowaway foldout keyboard (http://danbricklin.com/log/stowaway.htm). And that was on a 3" black-and-white display and a 16MHz single-core CPU! I know, right?

I wouldn't have wanted to program on it, but as a writing environment, it was fine. Now give me writing software of the same quality as WordSmith, a keyboard as good as the Stowaway, and my ho-hum Galaxy S3 with its 5" hi-res color display and a quad-core 1.5GHz CPU...