I work with a Hyundai dealer and he knows I'll be ordering one the moment he gets the details. Trust me, the dealers have no info yet. In fact, Hyundai has told more to the press, then they have to the dealerships. Most everything he has heard is form official press releases.
However, a good friend/auto reviewer he knows got to test drive the turbo in Korea a couple months back and gave it glowing reviews (off the record). He can't release his full review until the car is released.
Also, keep in mind that the huge demand for the regular Sonata is causing production shortages and Hyundai is having a hard enough time as it is keeping up so this could further delay the Turbo and Hybrid models.
I have a feeling Hyuindai wont make any announcements until they feel like they have the capacity to make enough of the new models.