What you're looking at is not, in fact, a next-generation Sonata or Azera. Instead, it's Hyundai's new Mistra, a mid-size sedan that will be exclusive to the Chinese market.
Hyundai says that the car will be positioned between the Elantra and Sonata, which explains its size: at 185.4 inches long, 71.7 inches wide, and 57.9 inches tall, the Mistra is marginally smaller than the Sonata (189.8 inches long, 72.2 inches wide, 57.9 inches high), and with a 0.9-inch-shorter wheelbase (109.1 inches versus 110.0). It's easily a step up in size, however, from the Elantra, which rings in at 178.3 inches long, 69.9 inches wide, and 56.5 inches tall.
The design cues are an interesting combination of Santa Fe, Sonata, and Azera. The grille shares the upside-down trapezoid shape that we've seen in the Sonata and Azera (called the Grandeur in international markets), but it's taller and thinner than the Azera's and bolder than the Sonata's. The headlight assemblies, with projector headlights and thin chrome surrounds, appear to be a softer, slightly more rounded version of those in the Santa Fe and Santa Fe Sport.
Around back, it's much the same: the LED taillight arrays sit beneath a chromed trim strip, a combination of cues from the Azera and Sonata. The sloping roofline and angled character line look much the same--a halfway point between the two models.
Hyundai didn't say exactly what would power the Mistra, although we'd guess a selection of four cylinder gasoline and diesel engines--much like the international-market Sonata. We'll likely find out soon: the concept car you see here will give way to a production Mistra later this year. The car will be made by Beijing Hyundai Motor Company, a joint venture between South Korea-based Hyundai Motor and China-based Beijing Automotive Industry Holding Company.