http://www.wired.com/business/2013/01/ff-seven-big-ideas/
tl/dr;

#1 Make Airplanes Rechargeable
#2 Fuel the Planet with Micromachines
#3 Spray WiFi Hot Spots on Everything
#4 Turn Deserts into Power Plants
#5 Put Digital Displays into your Eyes
#6 Declare War on Incoming Asteroids
#7 Make Skyscrapers out of Diamonds