I'm really hoping it's blu ray. It would make since because not only was Apple on the board of blu ray from day 1 of the format wars, but on their front page for the new FCP etc, they make several points of mentioning it (clearly at the moment for external drives) but they wouldn't focus on it so much, I hope, if they didn't have something up their sleeves ... (especially since that's about the only thing pc laptops have on MBPs at the moment ...)
http://www.apple.com/finalcutstudio...verlay_export.html#overlay-finalcutpro-export
Also, as far as hard media going away, that will never happen. Ever. Sure the absolute majority of transfers and work may happen through the cloud, but nothing can ever be as secure as carrying a disk to someone private, backing up things so that if your servers get destroyed and all your computers get hacked in to, you'll still have hard off-site copies, and the quality is just not nearly as good as a 50GB blu ray disk, and will take even longer to compare to a Red Ray disk when that and 4K come out.
Another thing is that most of us are spoiled living in cities that are either technologically advanced or that have businesses/universities that have enough clout to bring high speed internet to our areas, but geographically the majority of the country (not population wise, necessarily) still has terribly slow internet connections and streaming just isn't close to 1080p and Dolby TrueHD Master Audio 7.1 tracks yet, and downloading that would take FOR EVER. So, although sales of hard copies will go down, we'll never lose disks if even just for backup purposes. Many major companies that my friends work at still use TAPE backup systems that have been around for 20 years to this day. 10 years ago when the first palms and ereaders became popular the media and uneducated/illogical analysts and commenters were saying it was the "death of paper." we still have books, contracts, and files today. Our own US government JUST STARTED using TWO SIDE PHOTO COPYING THIS MONTH as part of the current administration's push to cut costs and inefficiency. Although I love the bubble we live in as people interested in and who seek out technology, you seriously have no idea how far behind the rest of the country is and how technologies linger for years and years and years.
As Michael Scott said (not verbatim) real deals are made on paper, that's where contracts are signed. The same goes for technology and format replacements: Moore's Law aside, DVDs have been out for well over a decade and some people still don't have players, and people are still slowly adopting bluray and by the time it becomes the mainstream, red ray and who knows what else will be out. New expensive PCs still ship with serial ports for christ's sake!