This is one of the most graphic, gory trailers you will ever see (including a little cannibalism ... yum!). And by that we mean it's OUTSTANDING!
No one has yet said who made it or what it's for, but a good bet is that it's kicking off promotion for the next Mortal Kombat video game. Although we can all hope it's for a film.
And yes, that is Jeri Ryan at the end.
UPDATE: According to Twitch, this is:
Fans of Mortal Kombat wondering when they'd get a taste of the upcoming feature film reboot of the franchise, today is your day. A nearly eight minute promo reel for the upcoming project has arrived online labeled as being from Mortal Kombat: Rebirth and I have confirmed absolutely that this video has NOTHING to do with the upcoming new installment of the video game franchise and is, in fact, a promo reel for the upcoming feature film. And, good lord, this is tasty stuff - worlds better than any of the original film incarnations.
Although the this too has been disputed. When we find out definitively what this is, we'll let you know.