Wow, if it's true about the 505 being used to replace the out of stock 500, that is awesome news!
My aunt asked me to order a Reader for her a few weeks ago and the order was canceled. I was told to simply wait for it to appear on the site again and order again. I'm sure my aunt won't mind trading with me, seeing as how she was already impressed with my Reader (and definitely will not use a reader as much as I would).
I'm crossing my fingers!