"We appreciate the support of our community throughout the development of the Legacy game update. As a ‘Thank You’ gift, we are giving all active subscribers (as of April 12, 12:00PM CDT, 5:00PM GMT or April 22, 12:00PM CDT, 5:00PM GMT) the in-game Legacy reward: the Legacy Tauntaun Ram Pet*, sure to be your new best friend!"
http://www.swtor.com/news/news-article/20120412-1