To solve the 1000x data challenge, we need more small cells, and everywhere - indoors, outdoors, residences, enterprises, in all flavors-3G, 4G and Wi-Fi, and forms - femtos, picos, metros, relays, remote radio heads, distributed antenna systems etc.! But, isn't interference a limiting factor? How dense can we deploy? What are the future enhancements that take HetNets to the next level?