One of the many vectors which delivers leaked information on upcoming phones is the device benchmark score. Many apps upload the results to online leaderboards for all to see. There's quite a bit of information to be gleaned from these online listings – basically the entire spec list. Now Sony is looking to plug this leak by blocking benchmarking apps.
A tester recently provided a screenshot of an unreleased Xperia device with a popup warning – in this case it was caused by attempting to install AnTuTu.

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Sony Wises Up, Starts Blocking AnTuTu Benchmarking App (And Maybe Others) On Prototype Devices was written by the awesome team at Android Police.