Here are my thoughts after "procuring" a copy and playing for 4~ hours.
If you have played the original Thief games, you'll be disappointed. It lacks the atmosphere and depth of the originals (it's very linear and scripted). The "swoop" ability makes the sneaking around part a little arbitrary but I can see where people can like it. The story I can't say much for as I haven't actually played through it enough, but I watched a full stream of the game about a week ago when it leaked and it gets hella silly. Also, loading screens are rampant, even in the main hub map and last between 5-10 seconds at a time. Gameplay wise, the AI is balls and has a very narrow FoV.
Take this with a grain of salt, I enjoyed the time I've played so far, and most of my complaints are from being jaded about the game not living up to its predecessors. It reminds me of Dishonored a lot, though I think Dishonored has a slight lead in entertainment value. I'd give it a 6/10, but it'd be lower if I bought it at current price. I'd wait for it to be 15 at the highest before buying it, and I'll definitely get it at 10.