I agree that tablets are going to be ubiquitous in the future, but it may not be iPads that get into the most hands. I'd like to see John put his incredible javascript knowledge to work on a great cross platform web application rather than a native iOS app.
As I replied a few minutes ago - it absolutely will be a cross platform application using web technologies. It remains to be seen how it'll be bundled (likely using PhoneGap, I suspect) so at that point most of the major platforms are feasible.
