802.11v allow the AP's to suggest the clients to roam to a specific AP or give a list of preferred AP's to roam. At the end the client decide when to Roam and where to roam.
802.11 packet capture can give you almost any information from the AP's side, the clients side, the RF side. Learn how to check the Maximum Transmit Power using a 802.11 packet capture
Upgrade any WIFI network to a new standard always generate higher expectations from the end users however as WIFI Professionals we need to be careful with the impact of use a higher modulation technique in the high rate effective coverage, the general rule is higher data rates demands higher modulation techniques and Higher Modulation techniques demands smaller cell sizes because the higher modulation techniques are very sensible to noise and data errors.
Every 802.11 communication flows form one layer to another, understand how the Layer 1 and 2 within the 802.11 standard works is critical to any WIFI professional