se7en7thre3 on 03 January 2016
we know the NX will be '16 or '17.
As far as PS5 & XB2, they won't come out earlier than '19 or '20, unless:
-NX becomes a huge Wii like phenomena
-XB1 gets completely crushed, so they rush first to the UHD market a-la 360 (HD).