As the only flat UHDTVs in the Samsung booth, the HU8550 line drew my attention. Interestingly, they have the jack pack on the back, not in the One Connect Smart Evolution kit. However, they still have a One Connect port, so hardware updates can be made to these TVs. They already have true HDMI 2.0 inputs and can accept 2160p/60 with 4:4:4 color, though the panels are still only 8-bit, which can't be addressed with a One Connect update.
Halleluia, flat UHDTVs in the Samsung booth!