Gruber said it right the other day. The time to start thinking about iOS 7 was a month ago.
I wrote an article about what app owners need to do now in order to be ready for day one. It's a tremendous opportunity, really, since Apple is likely to consider featuring you in your category.
This is also my first article ever to be linked to by The Loop, so it's something of a milestone for me. Onward and upward!