Either the closed alpha for Rainbow Six: Seige is already happening, or this is just developers or QA testers playing, but there’s now leaked footage and screen shots of the game in it’s closed alpha state.
The gameplay above and a screenshots below show some interesting details about the game, some good and some bad, but if you want more info and keep up to date on these leaks, head over here.
Aside from that, if you want to sign up for the closed alpha, go here.