The photos show the prototype iPad mini with an extra hole centered, atop the rear of the device. It is unclear as to why Apple withheld the second microphone from the final product release, my guesses would be that it was axed out to cut down on cost, or to be preserved for a future generation iPad mini.” -says Sonny Dickson, who has provided accurate intel and photos of leaked components in the pas.
And on seen the leaked pics the rumors can never be materialized, as the production version of the first-gen mini does not have a hole in the top of its rear casing.
The best thing is the iPad 5 will have rear mic located one located right next to its rear camera, so we expect the next-gen mini will too have.

