You can fit a full-sized GPU in ITX but the small ones, like those which get plugged into 4K monitors, have serious problems and this is where ZOTAC comes in.
The size of the card will give you decent 4K gaming and a cool reception for your 4K telly if you want an entertainment box.
The card has the same specs as a full size 1080 Ti with 11GB of GDDR5X graphics memory and a boost clock speed of 1,620MHz. The only difference is that it is 211mm (8.3?) in length.
It works with ZOTAC’s Firestorm tweaking utility for overclocking, fan speed control and monitoring.
ZOTAC has not spilled the beans on price yet, or even when it will be in the shops, but it should look like the other custom GTX 1080 Ti models.