What do you mean? Orange palette is a representation of Io-like sulfur moons. Brownish spots are dark organic deposits.
For example, taken from procedural selenas on different types of stars:
On February, I posted a question asking whether those "marks" were intentional or just a glitch, as at the time I had been looking for moon-like selenas (which would be completely grey, hence lacking those orange marks), but every single selena-type object I found had them. (
http://forum.spaceengine.org/viewtopic.php?f=5&t=168)
However, as you said (along with several people on the topic linked above, whose answer I just noticed), those are in fact sulfur deposits and thus intentional.
Therefore, is there a possibility to see stain-lacking selenas on the upcoming version (or even later on)?