If I'm not mistaken, it depends on how competitive the keywords being searched are. This forum is indexed but it would have to be a specialized topic for the contents to show up. Hope I understood the question.
There is a Google top 10 DP page for the keywords CHEAP SEO. That is funny ) Really depends if your keyword is competitive...
That is a new feature that has been out for 1-2 weeks now, Google "knows" about the structure of all the commonly used forum softwares so it`s not exactly magic to get up and running.