The Sword Art Online anime’s official site just updated with the information for the 4th volume of the Blu-ray and the Limited Edition DVD release for the anime, containing, apart from episodes 9-11, the Sword Art Online Original Sountrack I, composed by Yuki Kajiura as bonus CD!! The Blu-ray/DVD will be released on January 23, 2013. REMI of Sound Horizon sings for the first time in collaboration with Kajiura-san in this soundtrack, so its going to be pretty interesting ^^.
Title: “Sword Art Online” Vol.4 Limited Edition (Blu-ray/DVD)
Release Date: January 23, 2013
Product Code: ANZX-6607～6608 (BD), ANZB-6607～6608 (LE DVD)
Price: ¥ 8,190 (including tax) [BD] ￥7,140 (including tax) [LE DVD]
Episodes: 9 [The Blue-Eyed Demon], 10 [Crimson Bloodlust], 11 [Morning Dew Girl]
Bonus Content: booklet (16 pages), 3 pin up cards, clear case and digipak illustrated by character designer.
Simultaneously also comes out Regular Edition DVD[ANSB-6607, ￥6,090(tax included)] which doesn’t include the OST.
[EDIT] Fixed provided information, since Limited Edition DVD w/ extras & OST also comes out.