As long as they are just inferring what type of ads I am interested in, I wish that someone would just ask us what we are interested in. Or at least rule out the things we are NOT interested in. Like, stick a little button on their ads which says "dislike?" and we could click it and not be shown any more of those ads (or ads in that category).
According to the article, users will get a Ads Preferences Manager. It will show what Google thinks you're interested in and you can change the categories as well.