Well - in the context of area reskins there are no plans within the mod like there are with NPC reskins with RedRob41.
Nar Shaddaa will have Kexikus' High Quality Skyboxes but the terms of using Kexikus' work in ROR is that we can only use planets that appear in Kotor I or II in ROR - we can't take M4-78's skybox for a planet and use it for a planet that is not M4-78 for example.
My biggest concern for HD textures in ROR is that the HD textures will bloat the already large file size. Why should ROR be 10 Gigabytes when it could be 4 Gigabytes? RedRob41's NPC HD Overhaul, if he doesn't publish it as a separate mod, would be downloaded from the main ROR page like this example here:
You'd download the main mod on the top and the HD NPC Overhaul would be separate and optional, the above example shows five downloads but ROR would probably have two (though more may be needed if the file sizes are too big).
But as of right now, any major HD texture work in regards to areas would most likely be a ROR Addon - a mod you install after ROR. And I can hint that such a mod will be a thing in the future