BMW Apps to my knowledge still only works with iOS. The M5 also supports that Nuance speech-to-text feature for sending text messages on the go; I know that works for iOS but not sure about other platforms. It's not a free service either, though. Siri support as far as I know is not truly implemented yet unless you count having to invoke her on the phone itself, at which point you can speak to her through the car's mic.
That's interesting about the WP8 phone syncing pictures to iDrive, didn't know that!
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