Yesterday Sony Mobile GB tweeted that Android 6.0 Marshmallow will be start to roll starting from March 7. It looks like the news has become true because a firmware (Android 6.0 Marshmallow) has certified for Xperia Z3 Plus with the build number 32.1.A.0.434 over PTCRB. This will compare to the previous build number 28.0.A.8.272 (Android 5.0. Lollipop).
As the build number moves to 32 we can expect Xperia Z5 series and Xperia Z4 tablet will also have the same build number starting from 32. Stay tuned with us for more news