Colours of the company that's been developing it, presumably the final version will be nasa / white color scheme

Apparently they are keeping that under cover for competitive reasons:

https://twitter.com/skrishna/status/1635998864531439617

And I imagine it will blend into the lunar background, which also seems like an odd choice.

According to the NYT article linked above, the final suit will be white for thermal reasons. This color scheme is just for the prototype.

>Though this prototype uses a dark gray cover material, the final version will likely be all-white when worn by NASA astronauts on the Moon’s surface, to help keep the astronauts safe and cool while working in the harsh environment of space.

https://www.nasa.gov/feature/spacesuit-for-nasa-s-artemis-ii...