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Why Xperia Z3 can't display song information if we stream it via bluetooth? While my old Xperia Z can do it?
Sorry to hear that you have issues with bluetooth.
Z3 can send music information over bluetooth but Z3 has a later version of bluetooth AVRCP than Z.
What device are you testing this with? We have seen that some bluetooth devices don't send the correct query to the phone which may cause this issue. See this thread for example: http://talk.sonymobile.com/t5/Xperia-Z3-Z3-Dual/Bluetooth-now-playing-info-from-Wimp-missing-on-Z3/m...
I use Sony XAV712BT
That is one of the devices we've seen this with. It has to do with that the unit in your car sends another query than for music info. At the monent i can only advice that you wait for future updates for the firmware of the XAV712BT and phone.
It is your responsible to talk to your friends in Car Audio Dept to make it work well. Don't ask your customer just to wait!
It has of course been forwarded to the part of Sony supporting the car units but i'm afraid i don't have any information regarding when an update will be available for this. I will not be able to say when this will be fixed as the car unit is not supported by us here at Sony Mobile.