Doesn't seem like it - managed services will be handled different ways by different ISPs - which I would argue would allow (eventually) for smaller ISPs to say "well yeah, we offer x, y, and z and AT&T doesn't do that" and have a decent market share if x, y, and z are widely demanded.

Even the article's writer says that "after the conference call and reading the agreement, I’m not sure there’s much to say beyond the fact that this agreement basically keeps the network neutrality situation the same."