My site is a campus with multiple office buildings -- "low-complexity" as Aruba puts it -- without anything terribly unusual, no grand sources of interference or anything, just the usual conference rooms and some open spaces.
As we plan for a campus-wide deployment of AP-225s, it seems 802.11ac and Lync haven't changed the AP planning at all from an ordinary "capacity" deployment of 802.11n (planning and site surveying being done by an Aruba reseller and Aruba). The RF targets are pretty much the same, e.g. APs evenly spaced about 40 feet apart, a -65 dBm signal strength at each cell edge. Same as for "capacity" deployment of 802.11n, which might be fine.