No, this isn’t an April fools here despite the upload date on the video. This is the real deal, Thief 4’s announcement trailer has been leaked a tad early.
As seen in the trailer the game is expected to release on the PC and PS4 as well as other unnamed next generation consoles.
Trailer was awesome. I want to see some gameplay though. If it’s anything like Deus Ex, I’m sold. 😉