One big concern for QuizUp is the viral nature of its growth. Plain Vanilla recognized that it was missing out on "maybe 60-70% of the virality" by not having the game on Android. That issue has been rectified, but the next step is in expanding geographically. While you will see players from all around the world, the majority of current players are from either the US or the UK. This is because the game is only available in English, and the content of the questions skew towards natives of those countries.
Plain Vanilla is already working on not only translating current questions to major languages, like Spanish, German, Japanese, Chinese, and Korean, as well as generating new content specifically for those regions. It has even set up offices around the world to make this work more efficient. The future of QuizUp depends on how fast it can expand, as well as how it chooses to monetize.
Right now, it uses in-app payments to sell simple power-ups that make gaining experience faster. The company wants to avoid putting ads in the game, so it is trying to develop content partnership agreements to make money. Given the multitude of topics that cover games, movies, TV, music, books, and electronics, it may not be difficult to make those partnerships. However, we're curious how those partnerships would appear in game without being as distracting as an ad.