It is finally done! After about three and a half years, High Quality Skyboxes II for K1 is finally out!
You can find dozens of new screenshots by following the link above and I highly recommend that you upgrade if you are using the old version of my mod. There's also a video showcase here:
Now that the K1 skyboxes are out I will start getting the TSL skyboxes ready for release. The first step for that will be to take screenshots so the answer to your question is "hopefully soon".