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Big name actors love doing voice-over work on commercials, because it is a quick and easy way to pull in some extra cash without having to agree to be the face of a company. That's why you get actors like George Clooney selling Budweiser, John Krasinski in a BlackBerry ad, Jon Hamm selling Mercedes-Benz, and now we get Bryan Cranston in an iPad Air commercial...
Source: http://www.phonearena.com/news/Bryan-Cranston-leaves-the-meth-empire-for-the-Apple-empire-in-iPad-Air-ad_id48680