801.11ac, or 5G Wi-Fi, is backwards compatible with a/b/g/n standards, and promises a significant speed boost compared to 802.11n. From Wikipedia:

Theoretically, this specification will enable multi-station WLAN throughput of at least 1 Gigabit per second and a maximum single link throughput of at least 500 megabits per second (500 Mbit/s).