Back in 2011 there were rumors that BlackBerry was working on a BlackBerry 10 device codenamed "Milan", and according to the leaked render at that time, it was revealed to be a slider device similar to that of the BlackBerry Torch. Come 2012 word on the street was that the project had since been cancelled due to apparent hardware issues, and in 2013 we have not heard about the device, at least until recently where images released by BerryNationhave revealed a device of a certain Z15, the purported Milan device, although we're guessing this is more of a concept rather than an actual leak.
Ubergizmo , BlackBerry Z15 "Milan" Slider Concept Looks Pretty Decent, BlackBerry Z15 "Milan" Slider Concept Looks Pretty Decent