Well, it seems like there's enough buzz and info to consider this OFFICIAL!
All information from
Sadistic Gossip (who's source is from Ringohan)
ALBUM INFO:
Title: 逆輸入 ～港湾局～ (Gyakuyunyuu ~Kouwankyoku~)
Translation: Reimport ~Port and Harbor Authority~
Release Date: 27/05/2014
Limited Edition: TYCT-69017 (Y3.780)
Cardboard case with hardcover booklet (like Ukina/Mitsugetsushou) + B2 Poster
Regular Edition: TYCT-60035 (Y3.240)
01 - プライベイト(Private)
By: Hirosue Ryoko (07/10/1998)
Arranged by: Ken'ichi Maeyamada (Momoiro Clover, AKB48, SMAP, etc)
02 - カプチーノ(Cappucino)
By: Tomosaka Rie (27/01/1999)
Arranged by: Takeshi Kobayashi (Lily Chou-Chou, etc)
03 - 雨傘 (Amagasa)
By: TOKIO (03/09/2008)
Arranged by: Takamune Negishi (Cocco, Quruli, Mika Nakashima, etc)
04 - 渦中の男 (Kachuu no Otoko)
By: TOKIO (03/09/2008)
Arranged by: Takeshi Ueda (The Mad Capsule Markets, etc)
05 - 日和姫 (Hiyori Hime)
By: PUFFY (25/02/2009)
Arranged by: Tooru Hidaka (Beat Crusaders, etc)
06 - 主演の女 (Shuen no Onna)
By: PUFFY (17/06/2009)
Arranged by: Yoshihide Ootomo (Ground Zero, Kahimi Karie, etc)
07 - 決定的三分間 (Keitteiteki Sanpunkan)
By: Chiaki Kuriyama (02/03/2011)
Arranged by: Nobuhiko Nakayama (Shouso Strip, Sanmon Gossip, etc)
08 - 青春の瞬き (Seishun no Matataki)
By: Chiaki Kuriyama (23/11/2011)
Arranged by: Tomita Lab
09 - 真夏の脱獄者 (Manatsu no Datsugokusha)
By: SMAP (08/08/2012)
Arranged by: Shinichi Osawa (Mondo Grosso, Boa, Crystal Kay, Namie Amuro, pretty much anything Avex)
10 - 幸先坂(Saisakizaka)
By: Youko Maki (27/05/2013)
Arranged by: Yoshiaki Sato (accordionist in Toutaikai and Hantaikai)
11 - 望遠鏡の外の景色 (Bouenkyou no Soto no Keshiki)
By: Noda Igeki (06/09/2012)
Arranged by: Youichi Murata (Pizzicato Five, Southern All-Stars, SMAP, TOKIO, etc)
Covers:
Live tour info:
Tour dates set A
Shiina Ringo - Chottoshita Reko Hatsu 2014 ~Yokohama Kou he Gyakuyunyuu~
Dates: 26/05/2014 and 27/05/2104
Venue: 横浜大さん橋ホールは (Yokohama Daisan Hashi Hall)
Doors Open: 06:15PM
Start: 19:00PM
Tour dates set B
Shiina Ringo - Chottoshita Reko Hatsu 2014 ~Oosaka Kou he Gyakuyunyuu~
Dates: 05/06/2014 and 06/06/2104
Venue: Sankei Hall Breeze (Osaka)
Doors Open: 06:15PM
Start: 19:00PM
So there you have it, major cred to ShinjiPG, Yahiko and Chris on Sadistic Gossip for this info *which I have basically copypasted*! (and sorry for having my doubts @Shinji :-p)