P+DSP Media posted this in their official site on Oct 12,2009.
Details below!
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Hello. This is DSP media.
The fast changes about SS501 is releasing a Mini-album instead of a Full Album must have made Triple S daze.
This mini album was planned as a regular album yet we decide to change it into a Mini Album instead.
It is decided due to the tight schedule (of the boys currently have) it is impossible to add more (many) activities and that is why we have decided to release a Mini Album instead a Full Album.
Please understand this.
[Album Release Date]
SPECIAL EDITION: 10/20 (Tuesday)
Normal Edition: 10/22 (Thursday)
The Special Edition Album that comes with Diary in a flip book format w/ 100 Pages in total, photo books and poster will be released on Oct 20, whilst the Normal Edition will be released on Oct 22nd,2009.
As for the Online Sales will be open on Tuesday, October 20th ,2009.
[The broadcast schedule]
10/23 (Friday) : KBS Music Bank
10/24 (Saturday) : MBC Music Core
10/25 (Sunday) : SBS Popular Music (Inki Gayo)
It’s been 1 year and 7 months after the 5 members released an album that is why we hope Triple S will give them big love and encouragement.
For more information about the album we will give you further notice.
Meanwhile On Oct 14 & Oct 16, SS501 Solo Photos will be revealed online. In order will be : 2 member photos and then 3 member photos.
Thank you.
DSP Media
Source : DSP Official Site (translated by imuyachan for marinastory.wordpress.com)
Yay, I def cannot wait ’till Oct 23rd 😀
슈퍼스타 501 영원히!! 
hi, i wonder what’s the difference between the Normal Edition and the Special Edition ones?
PS i have already made my order for the Special Edition one! Yay! ^^
as stated above, the special edition will come with 100 page diary (flipbook format), photobook and poster 😀 they didn’t mention other things aside from those 3..so u have placed ur oder then ^^ thx 4 coming n keep supporting the boys 😀