Apple's next Beats headphones have reportedly leaked (again)

We probably won't see them at next month's iPhone event, though. Apple appears to be working on a new pair of noise-cancelling Beats headphones, its first in three years, and they won't stop leaking. MacRumors reports that a forthcoming pair of Beats headphones popped up in Brazil's National Telecommunications Agency database on Thursday, Aug. 20, according to …