The line up for Series 1 is Batman, Superman, Catwoman, and Wonder Woman.  For me, Catwoman and Wonder Woman are givens, even though they are not my favorite versions of the characters.  You can pre-order all 4 at BBTS...

Wonder Woman
www.bigbadtoystore.com/bbts/product.aspx?product=DCC11908&mode=retail

Catwoman
www.bigbadtoystore.com/bbts/product.aspx?product=DCC11907&mode=retail

Superman
www.bigbadtoystore.com/bbts/product.aspx?product=DCC11910&mode=retail

Batman
www.bigbadtoystore.com/bbts/product.aspx?product=DCC11909&mode=retail