I gathered that they are looking now for content that provides a question as their title,and than goes on to answer the question inside of the content they provide to the reader. I saw this announcement on the news tonight, and from now reading your article links here, it seems that many more sites are going to have to now scramble with some updates to their websites.
They say they have been testing this for a month now, so if you have not lost any traffic then it seems your site might have pasted their latest updates.
I just feel they are going back to some old methods that still do work, create the content based around what real people type in when they do their searches, like blackcat said, focusing more on long tail Keywords.
This is a good questions, thanks for bringing it up, hopefully it will be very useful to all the members here.
Hope my answer helps