It really hasn't. In the 30+ months of development since the first time the game showed up on this site the game has had an art revamp which is still missing some scenes from before it started, stat based dialogue changes that supposedly took a lot of work to implement although they only exist in a tiny handful of scenes, a couple of Legion scenes which (ironically?) had bugs making it impossible to complete, and a series of exercise scenes that ended up delaying the game by weeks because of how long it took to add in all the variants of the animation. Also, the drinking party, some new you content, and an upgraded waitress job. It really isn't all that much.
Either way, what seems to be quite a few people's main issue with the game's development(other than the lack thereof) is that all of it seems to be focused on side activities that have yet to tie into the main story in any way. At least the farm will probably be something that actively advances some Kira's paths toward and ending.