You can see more info about it here: http://ffhacktics.com/smf/index.php?topic=11170.0
It looks like it was "completed" in 2015, which is two years after the final version of 1.3, so I assume it's based on 1.3.0.8.
I can't say I agree with every change (also, I only skimmed through the changes), but overall I like the idea. I enjoyed 1.3 (I only got to chapter 3), but it was a little too tough for my old man self and stopped being fun at several points. A lot of these changes seem like good QoL changes (controllable guests, special units can go on props, inherent JP-Up) and some things to make the battles a little easier (not having the enemies have Party Level + 57 or whatever).
The only thing that I really don't think I like is that it says Meliadoul is a guest for every story battle after some point... that's weird.
EDIT: The other thing I don't like about it is that I can't find the patch to be able to play it... ![]()