I just got the instructions for the Special "Giveaway." It turns out that you need to use a Japan Post service (in conjunction with a Japan Post Bank account) only available in physical Japan Post offices, so it's impossible to do internationally. Sorry for those who have already sent theirs in.
The drama CD and the booklet comes out in late March 2012. I'm sure that at least the drama CD will get uploaded, but if you want physical copies, people will probably sell them on Yahoo Auctions. Hoshi no Samidare's giveaways are still being sold on Yahoo Auctions after 2 years, so I'm sure that this one will as well.