S8000 was initially rumoured to be running Android, but now it seems like it's more likely that it'll be running a custom Samsung in-house OS with a custom UI that is currently going under the name of Cubic, which is rumoured to look somewhat like LG's S-class 3D UI.
Feature wise the S8000 is very impressive as it's said to be packing a 3.1-inch AMOLED display with a resolution of 800x480. No details about the CPU has been leaked out, but the handset will feature 2GB of built in memory, a 5 Megapixel camera, WiFi, GPS with A-GPS support, Bluetooth 2.1, an FM radio, USB connectivity, a microSD card slot and a 3.5mm audio jack.
It should offer 3G connectivity on the 900 and 2100MHz bands as well as quad band GSM. It's unknown what data speeds will be supported, but with it being a Samsung device, we'd expect at least 7.2Mbit HSDPA. The S8000 will also support DivX and XviD video.
Two more models using the Cubic UI are expected in the near future, of which one will be the M8000 which looks similar to the S8000. However, the M8000 is rumoured to be featuring a smartphone OS rather than Samsungs own OS.