Do any of the reviews spoil anything major?
Man I'm so glad this is getting good reviews, will give it a go after x-com. Was the GT trailer spoilery?
None of the reviews I've watched are too spoilery.
I've managed to watch the Gametrailers/IGN/ElderGeek/TotalBiscuit WTF?! and none have spoiled anything too much. Granted if you wanted to go in knowing nothing at all, you'll naturally have that spoiled. But if you already know most of the gameplay mechanics they are mostly just the same praise across the board. You could watch one and pretty much have a baseline as to what the other ones were to say.
If you want something to look at like I did, you won't really ruin anything by watching those reviews. They all essentially say the same thing:
-Good Mechanics
-Good Art
-Cool Powers(especially blink)
-Emergent Gameplay
-Poor ending to the story.
That's pretty much all of the reviews in a nutshell.
Strangely no one has commented on the music, which I find strange as the composer Daniel Licht has done some great things in the past. From what I've heard from previews his music sounds great and seems to add quite a bit.