I notice this thread is more or less 100% congruent with this earlier "leak":
https://imgur.com/UBo9VFb
Which leaves three likely possibilities:
1) Both "leaks" are by the same person, pushing the same ideas.
2) This "leak" is by someone who saw the previous one and thought it was totally cool, but wanted his own attention rather than reposting it, and wanted to add detail to it.
3) It's actually real and they're very similar because they're both from people who have at least glimpsed the actual source.
The only point I see in favour of 3 is that in the imgur "leak" the language, which purports to be copied and pasted from a Blizzard source is quite close to the way they write and largely free of hideous typos, grammatical horrors, and so on.
Pretty skeptical though. Especially because the font of the imgur leak looks wrong for Blizzard and the model of Magni is just current Magni holding current Khazgoroth, and it seems unlikely Blizzard wouldn't make Magni into like, powered-up Magni with powered-up Khazgoroth.