That's quite different from the 4-inch display on the current iPhone 5 and the 3.5-inch display on iPhone 4 and 4S models still popular on the street. Indeed, six inches would make for one of the largest smartphones on the market.
The motivator? Growth. As Apple's nearly legendary decade of success begins to slow, the company is searching "for new engines of growth," the Journal writes. The stiff competition from rival Samsung certainly hasn't helped, either.
Apple typically tests various configurations before deciding upon the version it will take to production, though it is interesting that such an established and successful product would continue to evolve with regard to its dimensions—in this case, in the opposite direction that technology tends to move.
Will Apple follow the market, or set the benchmark for it? We'll find out.