It's fake. It's so fake.
Not only has everybody pointed out that it is indeed the Melee voice announcing, the quality is extremely low, and of course, the player only records the character selection screen, and the beginning of Classic mode which, incidently, are pictures we've seen before. Sure, we haven't seen the exact screen, but with enough work, you could conjure up a roster.
And, if this is indeed the leaker who took pictures of the game disc and screen, it's apparent he wants to leak info. So, if you had Brawl, and were anxious to show people the secrets, would you, too, only take a close up picture of the disc, and the selection screen? Two things we've seen? It's the obvious way to convince people you have it without showing them things they haven't seen. Until a leaker shows legit proof that he's seen stuff we haven't seen before, I'm calling BS on all of it.
Not to mention, there's all kinds of evidence going against the 35 character theory, in my opinion. Not only has the ROB issue been repeatedly brought up, 35 characters is just over what we already know. Including the "semi confirmed" characters, and characters that are understood by 90% of the population as returning, that leaves like, two spots for new characters. Sakurai said he was going to be careful about not spoiling secret characters. If the rumor is indeed true, he's pretty much spoiled ALL of them. Not only that, but didn't Nintendo say the roster size would be "Immense" or something? I'm not complaining about the roster, because it's already well past Melee's, but in all honesty, I don't believe the 35 rumor one bit.