The truth is, nobody really knows how this will be handled and those developers that may have information on the new screen size will not be going on about it until the official release occurs (obviously)...i can imagine a similar scenario to when 16:9 televisions became the standard setup and you had the bars (and still do) on 4:8 ratio pictures (though obviously that is not the same situation with this screen since it's still going to be a wide format setup).
From what i understand reading what some game designers have said, if the screen is both longer and wider, the adjustment is easier than simply a longer screen (as some of the rumors have hinted at).