There was just a revision back in June so there won't be a revision until mid 2013 in regards to a regular 13 inch MacBook Pro.
I meant it will keep the same design of the rMBP, but in a 13-inch form factor, lol.
Well, we knew this time was coming.A 13" rMBP would seriously overlap a 13" MBA.
The MBP design will be with us for a couple of years yet, remove the optical and you get a MBA. There has just been a minor revision update, nothing now until next year.
I think that they will update the MBP 13 to the retina design soon. In 2008, they redesigned the MBP's to the aluminum unibody we have today. In early '08, they updated the 15 and 17 inch. In October, the updated the 13 inch to the unibody design. I believe the same will happen this year.
This October, the 13 inch Macbook Pro will get retina, and the thin design, for about $1599.
It will NOT replace the MBA, because the MBA will be thinner, and $400 less, without retina, based for consumers.
Your timeline is a bit off
They updated the 15" and 13" (called the Macbook then, not the Macbook Pro) to the Unibody design in October 2008. The 17" stayed at the old design until early 2009.
Agreed on everything else though