Hi Sylvain,
Thanks ! ETA is here Update on stock - #6 by Raspiaudio
Radio is based on S3 with PSRAM so yes it should be possible to use local wake work, but I have not tried it yet.
Amp is about 11-12W it uses a boost converter to raise voltage to 17v from the Lipo cell, let say that is a quite loud.
We are in Paris too btw