TL;DR - Software and infrastructure is more important than hardware.
Not a new observation but one that is worth thinking about now and again.
One of the interesting things I observe about mobile devices is their use as a function of their connectivity. Which is to say tablet with no network connectivity isn't as useful as a tablet with network connectivity. The networks are growing, but outside of major metro areas they still aren't great. The previous generation of laptops carried enough along to be useful during long periods of no connectivity [1]. So things like maps that aren't maps unless you're connected are less useful. (Google finally caved on that slightly which I applauded)
Perhaps the next thing is better reference tools. As a search company I get to see a lot of things people search for and reference searches are still a big chunk of search. That is however a place that could easily be disrupted by localized data. All of Wikipedia, maps, phone books, dictionaries, etc etc etc are actually small enough to carry around now. Sure you want updates to come from the web but the main corpus? Doesn't change that much. Who is going to build the Encyclopedia Galactica?
[1] I remind people sometimes that 'networking' was an add-on feature for the first laptops.