Good question, in my opinion here are the top 5 possible points for the future of search:
1. Mobile will be even more popular for search!
2. Social will even play a more important part in search!
3. TV based search will be even more popular!
4. Google+ and Google+1 will be a popular player in the market! – 200 million users+
5. The level of person to person customization based on friend data will increase.