The AFK issue for Battlegrounds has always been a contested topic for PVP-intensive gamers who are serious about earning enough Battleground Marks and Honor Points while playing World of Warcraft. Bornakk mentions that the Blizzard dev team will be implementing a Hotfix that will help reduce the number of AFK reports issued while in a battleground.

This will be implemented to help improve the quality of play and streamline the system when flagging someone as AFK during the battle.

Here's some more information found on the World of Warcraft website regarding AFK reporting:

A new feature for reporting players as being AFK in battlegrounds was added in patch 2.2. Right-click on their portrait, minimap dot, world map dot, or raid tab, and then select "report as AFK". When enough reports are registered, a 60 second debuff will begin to count down. It also prevents you from getting battleground marks, and completing your daily quest if it is for that battleground. To remove this, the player must enter PVP combat, as attacking the neutral mobs will not remove the debuff. You must attack something that is pvp flagged.