Nanobots. Think of the possibilites. Send them into your body to remove clogged arteries or destroy tumors down to the cell. Repair damaged tissue and even strategically place stem cells. 10-20 years before this will become a reality.
Self-Sustaining Fusion Reactor. Mass amounts of clean energy. More efficient than Fission reactors, as well as less deadly. Plus they're much easier to find the materials to sustain. 5-20 years depending on when that one in France is to go online.
Artificial Intelligence. Can provide much help to the travel industry, as well as the business industry, manufacturing industry, and the way cities are run. Eliminates much human error in machines, and could work out problems like a computer. Unknown amount of time.
Hydrogen Powered Cars. We already have these, but when they become more widespread use, that's when things will be interesting. Think about it, much less emissions, better efficiency, and all the positives of a current petrol car without any of the downsides.
Stem Cells. Research can help find out why cancers happen, and help prevent it. Many other positives as well! 5-15 years.