As the airline (IATA Code JX) prepares for its inauguration flight in January (1/23/2020), details on routes, uniforms and cabin are starting to get announced.
has the uniform announcement (starts about 16:00) and a Q&A session at the end
https://onemileatatime.com/starlux-airlines/ has some more information.
Interesting facts:
1 - lie flat seats in the A321neo front cabin
2 - free wifi for all passengers