Here is what DC is doing for "Detective Comics #19/900".
http://www.bleedingcool.com/2013/01...olds-the-line-at-7-99-for-issue-900-issue-19/
Heh
DETECTIVE COMICS #19
Written by JOHN LAYMAN
Art and fold-out cover by JASON FABOK
Backup story art by ANDY CLARKE
1:25 MAD Variant cover by The Usual Gang of Idiots
On sale APRIL 3 • 80 pg, FC, $7.99 US • RATED T
Combo pack edition: $8.99 US
• In a special oversized celebratory issue, Batman is challenged by the “Mystery of the 900!”
Either Damian's been calling a few 900 numbers or Bruce is investigating why his magazine says "19" on the cover instead of "900."