Usually anime announcements hype up the readers before they actually announce, except there's none of that.
Not to mention giving way more time before an actual adaption occurs.
Actual leaks of substance are generally also posted to 2chan in some form, but not seeing any of that either.
And then the cover is already out all over official sources, but doesn't include this yellow text (I have no idea what that lowres thing is),
so either they are really working hard to keep this hidden, something mags almost never do, or it's fake.
Not saying it's a hoax for sure, but just don't get your hopes up, as there are factors here that don't make this an airtight certainty.