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They suspect they update is timed to coordinate with the Windows Phone Summit on the 20th July, and that other Windows Phone OEMs will also join Nokia in rolling out the update.
They have also been able to confirm with Nokia contacts in Madrid that the Lumia 900 will come to Spain with Tango preloaded.
Separately WPDownunder has confirmed the Tango update currently being in testing for the Nokia Lumia 800 will bring WIFI tethering , so there is certainly more than simple MMS updates for low-RAM handsets to look forward to.