OK. let's let the cat out of the bag. I'm the one doing the texture mod that N-DReW25 is referring to. In fact, I had done a version of this before. However, now that I've had more time using the Topaz Gigapixel, I thought I could make improvements on what I had already released to @N-DReW25 and Makr0n. I've sent them the results of my upscaling and I would like to get their input (and perhaps some screenshots for the download page?) before releasing the textures to the general public. With that said, it's best to temper your expectations first. Here's what my upscale package won't include from the textures included in the ROR package itself.
Characters, creatures, portraits, droids, or outfits: The reasoning for this is that RedRob41 originally did the ROR textures for this category. It seems very likely that in the process of working on his own upscale package for TSL that he'll tackle the ROR textures for these categories as well. Though it seems that N-DReW25 has been in discussions with RedRob41 about this from what he posted above, I personally have not. So I can't even make an educated guess when RedRob41's work on that would be done. So keep your eyes open for updates to the Dev Diary section.
Skyboxes: Skybox textures tend to be huge! Leaving that aside, a few of the ROR skyboxes were done by Kexikus. They are fine as they are! They would not benefit from upscaling - and even if I were encouraged to do by all involved on the ROR team and Kexikus - they would be at the size that would impede proper playing of the game.
Load Screens: In order to redo these, you'd have to recreate the poses in the mod as presented in the load screens themselves. You'd probably want to use my upscaled textures and the ones that RedRob41 (likely) will be doing down the line. We don't have those upscaled textures in the first category (yet) so that holds things back. And with the passage of time, who's to say that the team would want to use the current set up for each of the individual load screens? Even if all of those things were dealt with, I honestly don't want to go through the entire mod in order to set up those poses.
And all of the above doesn't cover all of the textures that aren't included in the Revenge of Revan mod. I'm now talking about the vanilla TSL textures. I imagine that's something you'd have to use another HD / Upscale package for. Several are being worked on that moment but until they are done, you might want to keep your eyes peeled on the ROR section for recommendations of what the team suggests to use alongside ROR for the rest of TSL textures.