Lots of interesting information about the architectural advancements, as well as some more info about the differences between the TU102, TU104 and TU106. It appears the GeForce RTX 2070 will not be based on a cut-down TU104, instead it will utilize a full TU106 GPU. The latter has a die size of 445mm², so unlike what NVIDIA's naming convention makes you suspect, it's definitely not a mid-range chip.
You can find the full details over here.