According to Network World, they are as follows:
1) Rapid adoption of 802.11ac Wi-Fi technologies.
2) 2.5G and 5 Gbps in the wiring closet.
3) 25G, 50G and 100G in the data center.
4) Cloud-scale networking.
5) Open-source networking.
Full story: Five network trends challenging the enterprise (networkworld.com)