While everything gets smaller and more compact, I still think configurations as they are now will for the most part perservere
There will still be laptops, mini-laptop/webnoteboks, tablets and iPhone sized wireless devices.
But their potential I wouldn't even begin to think of where it might be..
1980: first space shuttles, walkmans, Miami vice and Reaganomics for the first time.. basically the modern world, right?
The computing hardware in those shuttles was less than a current smartphone, in raw processing power, speed and memory.
The computer next to you that you play you multiplayer wizz bang entertainment on represents more processing power that what Houston ground control had at their complete disposal.. Every calculator they had at the time..
-that means with my phone, you guys manning my computer, and a space shuttle I could get to the moon..

go back another ten years -Gemini / Appollo program and things get really [censored] scary

SO...
40 years from now I would think that although devices may not be truly artificially intelligent by then, the average user will be hard pressed to noticea difference.