We already covered the contents in our earlier news post, but to sumarise, besides the game, you get an artbook, selections CD, song lyric cards, stickers and DLC codes.
The Fates special edition roughly sold out in an hour, so it’ll be interesting to know how quickly this one sells out (assuming it does).
Update: Yup, they’re all gone!
Or if you prefer the standard edition, you can pre-order that too, via this page. Note that shipping is only available to UK addresses.
At the time of writing, it’s not clear when pre-orders will open for other European countries; if you have any information, please let us know!