Very clever post from Jesse Rosten... Going "vertical", surfing the wave ( or in the wake, for those who are going to be late on that... ) of the iPad and other upcoming tablets is an exciting challenge for movie makers and story tellers...!!
This is an interesting perspective that'll bring new ways, new feelings, new techniques to an aging industry... Tooling a most welcome "convergence" with other expression and creation arts...!!
Vertical framing ( portrait ) is already part of a photographer's palette of techniques to convey special meanings with a picture...!! When it comes to landscape, this is - though - quite unusual as horizontal ( landscape ) framing is primarily used for scenic vistas but portrait framing is, hence, worth digging into it...!!
In this related post, Jesse Rosten provides an example of "Mag Cover" where lots of overhead is provided in the picture framing for adding texts and graphical elements... just like in press photography...!!
Creation of interactive magazines content ( covers, but also inner pages !! ) will tremendously change and bring exciting opportunities for true multimedia ( say, transmedia ?? ) creators, editors, redactors... etc...
Nice, challenging and exciting times ahead...