Given the success of big-screen smartphones, most notably Samsung's 4.8-inch Galaxy S III and 5.5-inch Galaxy Note II, Apple is almost certainly developing an iPhone with a display larger than its current 4-inch model. The iPhone 5's relatively tiny screen may be gorgeous, but smartphone makers are quickly learning that size does matter to consumers -- and 4 inches just won't cut it. This doesn't mean, however, that a 4.8-inch iPhone will arrive in June, August or any time at all in 2013. There's a better chance we'll see a 4-inch iPhone 5S with minor improvements this summer. Ho hum, perhaps, but in line with Apple's time-tested tradition of introducing a major iPhone upgrade every other generation. Now, the iPhone 6 should be something special.