here´s the full video:
and i DON´T belive it´s FAKE ... because:
- 3arc Logo & name are written correctly (another video showed up wirth "TreyErch" as name)
- if he (she ?!) zoom in @ the Call of Duty Black Ops II - Logo (0:02) ... there you´ll see, that the logo is correct.
(because BO2 is the first CoD where are "slices" in the letters "A" (cAll) and "Y" (dutY)
- the menu shows the original background image of BO2 (that already been confirmed)
- it´s clear to see, that its a preview / demonstration of the XBox-Version (because of the button "A" and/or it´s common for developer, that they begin with the XBox-Version of a multiplatform-game.
- on 0:17 you can see, that there´s a description under the option "Story" ...
as it reads: "You will understand everything" ... and if i´m not wrong ... if´ve seen a twitter post from a developer, who postet exactly the same sentence. (it could be, that it also was an interview instead of a twitter post.)
- if he (she ?!) zoom in @ 0:50 there we can see an account from 3arc => "[3arc]BO2_59117" incl. the playercard (with emblem and title)
- @ 0:53 we can see, that he (she ?!) was caught ... maybe fear or something ... i don´t know. i know, it´s not a prove, but in sum it all makes sense (for me anyway)
if this, or something like that was postet already, then you can feel free to delete this answer.
i just wanted to share my information and my opinion.