Finally! I literally thought this day would never come. After all, many corporations in the tech industry have gone out of their way to not listen to their own customers. Online advertising has gotten too out of control, and needs to be pulled back somewhat.
Now all we need to hear is that online advertisers are willing to take DNT headers into consideration. Unfortunately, it doesn't appear that these advertisers are going to start taking Do Not Track into account. Although DNT was intended as a way to opt-out of surveillance, it appears that Google and others are going to ignore it as they always have.
Also, it doesn't appear they're going to do anything about ads that slow your computer down. You don't need a whole lot of bandwidth to download a RAM-hungry or CPU-hungry JS script.
Still, at least they're doing something about tracking pixels. That's a very good start unto itself. They are also going to do something about ads that suck up users' bandwidth, which a much-needed course of action. Improved pageload times is always a good thing.