I know people who have gotten it and had had no real issues, you know how good AM2's online code is, and they do patch it so I would not worry.
SEGA's financial year is ending in March, the time they release all of the games they have left (sometimes rushing some stuff out at the last second). If it is not announced for a release outside of Japan yet, it is not coming at all.
I am thinking I will order the Memorial Box edition, but it is a lot of damn money, so I might just snap and get the normal edition around April, since I want to focus on PlayStation 3 stuff for awhile.
EDIT: I posted it before on another topic, but anyone who wants to find people to play the game with should check out
http://www.oratan.com/