Update: It turns out that Hisense is indeed showing a 15" OLED TV. The panel is made by LG Display (the same panel that is used in the EL9500). Apparantly Hisense plans to ship this TV during 2011.
Hisense issues a press release today, saying that they are introducing new technologies at the CES show. One of the new technologies is OLED TVs: "Hisense's executive vice president Lin Lan introduced the company's newest technologies and products debuted at the show. Hisense's Hi-smart TV, new Hi-Touch TV, Internet-connected TV, OLED TV and large-size cinema TV demonstrate the company's major breakthroughs in technical pre-research and new product development."
We're still not sure if Hisense has an active OLED TV program, and whether they actually intend to launch an OLED TV soon... We'll have to wait and see.