A little late, but the details on the 3rd comic CD Collection are out~
Title: Fullmetal Alchemist 3rd Comic CD Collection: The Scars of Sinners (鋼の錬金術師 Vol.3 咎人たちの傷跡 コミックCDコレクション)
Release Date: May 31st, 2005
Publisher: Square Enix
Product No.: ISBN 4757514506
Official description's translation:
In search of the Philosopher's Stone, Ed & Al come to a town heavily guarded by the military due to a terrorist threat. There, the Elric brothers meet a young man, Leon...
More information of comic CD collection series here.