Article mostly says what we've already known, so I'm skipping to the limited edition stuff.
Platinum Stars All Star Live Pamphlet - Pamphlet for one of the All Star Lives that takes place in-game, loaded with idol charminess... and stuff.
Original CD, "Ris-ani! LIVE 2016" - CD of Im@s music performed at the Ris-ani! LIVE 2016.
1. THE IDOLM@STER, sung by Haruka, Yukiho, Hibiki, Uzuki, Rin, Mio, Mirai, Tsubasa, and Serika
2. 自分REST@RT, sung by Haruka, Yukiho, and Hibiki
3. GOIN', sung by Uzuki, Rin, and Mio
4. Dreaming!, sung by Mirai, Tsubasa, and Serika
5. Onegai! Cinderella, sung by Haruka, Yukiho, Hibiki, Uzuki, Rin, Mio, Mirai, Tsubasa, and Serika
6. Thank You!, sung by Haruka, Yukiho, Hibiki, Uzuki, Rin, Mio, Mirai, Tsubasa, and Serika
Platinum Stars Game Disc - No really.
765 Pro Calender - Twelve month calendar.
765 Pro Idol Photo Set (6 photos) - Art cards of the idols at training camp or concerts and stuff.
Photo Frame - You can put the limited edition photos in this limited edition frame!
Original Color Costume Download Code - DL code for the Antique Star costume.
Special Artful Box - Don't mind the picture right now, they'll be slapping some art on that box of our 13 original idols.
(First-Run bonus) PS4 Theme - Comes with the first run standard, limited, or download versions.
Regular edition is 8200 yen, and the limited is a whooping 12400 yen, with tax on top.
Keep an eye on the Platinum Stars page for store specials. Me personally, I wouldn't preorder until I know what stores are giving what.