Tango firmware build 8779 was available for “Rogers” some time back. Now it is available for AT&T Lumia 900 as well on NaviFirm. So may be a roll out will take place soon.

Seems folks at Wpcentral already updated their Lumia 900 with the Tango firmware and are reporting dramatic improvement in camera quality thereby.

This is what has improved according to wpcentral,

As we mentioned yesterday, metering itself seems much more accurate, correctly following our tap-to-focus area and adjusting the exposure dynamically to match the scene. Image sharpness also looks to be improved whereas our previous images were much softer.

Finally, other things like white and color balance also seem to be much more accurate, resulting in very neutral looking photos.