I live in Old Aurora and know the feeling of "what's going on"? There are 3 homes for sale on my street alone - the most I've ever seen at one time. But, one is a foreclosure (which is the case for several in the neighborhood) and one is a family that bought post Katrina that is returning to their original neighborhood. I know that a few of the homes for sale are from investors that picked up cheap properties, did some improvements and are now selling. Some of the others are due to the deaths of the owners (remember, there's still a pretty significant portion of the neighborhood that has been there for years and years and is getting up in age).
It's more than likely just a coincidence of timing - it sometimes happens in real estate where all of a sudden it seems like an entire neighborhood is for sale.