A leaked list of Bones animators revealed a second season Fullmetal Alchemist and Darker than BLACK. The list apparently also contains phone numbers and home addresses of said animators.

Edit: [profile=dtshyk]dtshyk[/profile] of MAL has uploaded the the files with the personal information blacked out.
File 54 No.74 入江秦浩　"鋼2監督"　Irie Yasuhiro: FMA2 Director
File 56 No.355 真庭秀明　"鋼2キャラデ"　Maniwa Hideaki: FMA2 Character Design

Update: Representative director of Bones, Minami Masahiko has posted a statement claiming the lists are fake and that they are not from Bones. However, Ueda Shigeru, Mnemosyne director, received a fax from an unnamed company apologizing for the leakage of his personal information. He checked the list and said the phone number and address listed for him was correct. Bones did not specifically deny the second season of either of these shows.

UpdateUpdate: MOONPHASE, which I'm sure anybody who keeps up on the latest anime has heard of, said he received a tip a few months ago that Bones was planning to announce a new Fullmetal Alchemist anime that would follow the original anime.

Source: Canned Dogs (All updates are from other Canned Dogs posts)