Still not in the supported devices list, however, these some weeks old additions to sonyxperiadev GitHub could perhaps be interpreted to be a possible sign of something (as in, Sony adding it to the supported Open Devices, no comments or guesses made on any further actions by any other parties) happening sometime soon™. As a previous data point, Xperia 10 II seems to have been added to supported platforms 3 weeks after the initial GitHub repository commit.