It remains to be seen if we will need to run dual-Gigabit cables to 802.11ac APs and aggregate the links to support the WLAN 802.11ac bandwidth. We are not there yet, but throughout my career, whenever the speeds increased, the applications followed.
VLANs. If your existing network is one flat subnet with (say) 100 devices, don't expect to be able to add 300 wireless clients to the same subnet without running into difficulty.
Keep those wired ARP requests off the wireless by setting up VLANs for the wireless clients. Better still, put the APs (and the Hive manager if local) on their own VLAN to keep those inter-AP communications on their own network.