Actually it sounds like all rumors to me. Notice how the writer says predicts a coupe is next logical addition. The pics are nothing more than PhotoShop images but love how they word it to sound like they have the real deal. There is noway any company will release fully undesguised photos before anyone has even seen spy pics. I don't expect to see a coupe for a few years yet if it is even on the table.
I'm not sure where you heard that Hyundai will be producing the Sonata as a coupe? According to John Krafcik, the coupes in Hyundai's stable so far are the Gen Coupe and the soon to be released Veloster. That "shopped" image has been making the rounds for the last 6 months or so now.
Its fun though to speculate but this is least likeliest to happen as in less than zero chance.