Berzerk doesnt indicate anything.
This song had a purpose bigger than most of his singles need to. He let the world know, in a fun and catchy way, that he's going back to his roots with some vintage slim, and did so with some throwback classic samples (also paying homage to some great old rap groups). He made fun of the rap game as it stands, including the fans of it. And showed a little of that vintage, dont give a shit Slim throughout the hook and in the last verse making fun of celebs and showing he doesnt care.
It's a direction that I'm really looking forward to. A modern day MMLP thats dark and still holds that old school feel could be golden if done correctly. And I imagine Em has that covered, he wouldnt call it MMLP2 if he didnt.
I also still expect some songs that arent necessarily as dark, with a few rock/playful songs mixed in. Lets not forget that the original MMLP had a few playful songs and it was an overall dark album, so I'm not worried.