My choices:
1. Cyanogen. This company should develop a credible path for AOSP (non-Google Android) especially in India. I expect a lot of traction as OEMs who embrace Android reject Google.
2. iPad. Not as a consumer product but for the Enterprise. The iPad grows up into a solid product for business while being replaced by phones in consumer “jobs to be done”.
A few more ideas are listed here: The 2015 “Sleeper Ideas” List: Trends, Stocks, And Private Companies To Watch – Forbes.