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Gambling from a mobile device will be huge. Not only will the gambling market see an explosion, but there will be spinoffs, such a security and cheat detection companies.

Also, a market that is growing fast that you may not be aware of is daily fantasy sports. Fantasy Football is considered a "game of skill". So, companies are popping up that allow users to build "fantasy teams" that only play for one week. Basically, you are using your skill to pick the best players for the week.

IMO, the companies that are doing well in this market have poor marketing and a 1990's aura about them. Someone could just in right now, buy a subscription to a stats provider, make a slick mobile app, and take the whole market.