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?