I like the subtle correction, too.
What do you have in mind for a new grading?
It would be similar to what I did for ANH, with an approximation of a Technicolor look. Scene by scene regrading to give them a older, more filmic look and make the skin tones sing. I don’t want to do that for this version however since the governing principle is for changes to be less-noticeable whenever possible.
Concerning whether V4 is the final version, it’s probably 98% there. I was hoping to hear back from SirRidley about the Han Dice Hanging scene to include, but it looks like that won’t be included in V1 so it looks like V4 (107 in the file) will be pretty much accurate to the final full bitrate version sans the color correction and final tweaks to audio.