It's not actually random, it's a marketing stragtegy. They always release the best titles at the beginning.
OK, I didn't realize they were coming out one at a time. I don't get it. Couldn't you just buy the first one to get the box, then put all those other CDs in there if you already have them? Is there anything different about the CDs now? Why do you have to wait for CDs to be released if they're already in stores? I guess the DVDs and "Love" might be different, but this seems strange to me. Sorry, very confused.
They're not in stores yet, they'll release one every week for the next 22weeks. The Anthology dvds will be released in an unique and unreleased digipack version.