Peter Schreyer, President of Kia Motors and Chief Designer Officer for both Kia and Hyundai, recently said that the Korean automakers needed a halo car to make the brand more known among the younger audience. This is relevant because of the sketch you can see above (and below), indicating the halo car Peter Schreyer was talking about, could be the cabrio version of the pro_cee'd GT.
This wouldn't be the first time a car manufacturer did that. Recently, Volkswagen introduced the Golf GTI Austria, a car that was highly praised by the public and the press, so Kia might want to take advantage of that. Also, don't forget that Kia introduced a cabrio version of the first-generation cee'd that never got to be produced.
Source: kia world