According to some members of the prime modding discord, log file carry-over is NOT true for the Remaster. So a new game overtop an existing 100% log save would restart your log scans at 0%. If that does hold true, a cheat would still be needed for anyone who doesn't feel like remembering every little scan again lol.Seconded. This is how I play Primehack every time.
I don't think we'll have to wait very long for a 100% save file. I'm personally trying to figure out how to edit the save.bin to unlock hard/veteran mode myself (since, if this is based on the Metroid Prime Trilogy version... then normal mode is actually much easier than it was in the original game) but a 100% save file would be absolutely wonderful.