While LTE (which some people call 4G mobile network) is on the way of getting deployed, discussions are ongoing towards 5G mobile communications.
The talk states that "a new radio interface" is a potential challenge, but integration aspects of heterogeneous networks are far more important. These aspects include seamless authentication across networks and "the business of heterogeneous networks". One focus is on the future SIM as an enabling technology, addressing the seamless access. The second item is on business aspects - "is there a business?" in heterogeneous networks.