Rovio, the Finnish maker of the popular Angry Birds games, is talking up an initial public offering saying that it is looking to rival Burbank-based Walt Disney Co. as a media company. Rovio, now says it is planning an IPO on the Hong Kong stock exchange in 2013, according to an interview in a Finland paper. Rovio said its goal is to be worth as much as Walt Disney Co. is on the markets. Disney is valued at around $65 billion.