Just posted on the AAdvantage Facebook page (bolding is mine):
Introducing the new Citi® Platinum Select® / AAdvantage® Visa Signature® card with free first checked bag, priority boarding, and more! Learn more at
http://bit.ly/GCLGmD
Cardmembers that currently have the Citi® Platinum Select® / AAdvantage® Visa Signature, Citi® Platinum Select® / AAdvantage® World MasterCard, Citi® Platinum Select® / AAdvantage® World Elite MasterCard and Citi® Select® / AAdvantage® American Express will start enjoying these new benefits today!