Rovio Mobile Ltd., developer of the “Angry Birds” mobile game, is eyeing an initial public offering in three to four years, its chief marketing officer was quoted as saying today in a Finnish business daily, Reuters reported. Peter Vesterbacka, the company’s chief marketing officer, estimated that Rovio’s 2011 revenues would be between $70 and $140 million – about 10 times its 2010 revenues. The firm is opening a new office in China and is considering whether to open offices in Japan and the United States.