The Ti is based on the same chip as the Titan, like last generation.
My best guess will be. 250W. 12B RAM. 3300 CUDA cores. 1500MHz chip, 1600MHz RAM. Maybe $800
I'm a little more interested in the new AMD Vega chip.
Rumors are it is going to outperform the TitanX in every aspect but this is still all rumors at the moment.
if all that comes out at $800, i think the regular 1080 might come down some in price. hopefully.
i'm not convinced that Vega will be that great. but only time will tell. and if it's anywhere near that performance, AMD has a history of being power-hungry