I have heard these rumors too and if so I´m going to be pissed cause I just dished in excess of 1000 grand for an Xperia Z + Sony PHA-1. Granted I don´t think any cell phone will have a DAC/Amp that will rival the PHA-1 built into it without being the same size. Never the less, its a fact that these big corporations never go all out becuase they have to feed tech slowly to make a profit.
Sony will not come out with a high end DAC/Amp + high end Camera and Top of the line cell phone. They will do this gradually and every step or upgrade will make them money.
The fact that every model has a compromise is not casual its an intended defect so that the next model...well you get it right.!