I played through a bit, and found some "problems". But I will talk about that later.
Changes:
You can upgrade your house and you can upgrade the shop. You can also build a brothel.
Toph has a 2 new lessons, one gives you access to new part of the tunnels where you find Suki. You can free her and hypnotize her to get naked for you.
The other lesson gives access to a new scene with Toph where you can titfuck her. Same rules apply as the tit massage, small tits and big tits both accessable.
Furhter more you can hypotize June to become a slutty waitress.
Joo Dee has received some scenes.
Problems:
Game crashes when I try to have a crab battle with Iroh.
Upgraded my Shop but I can still upgrade it.
Ty Lee "joins" the group only if you upgrade the Brothel, but there is no option for it.
Lastly after a few hypnotize sessions with Suki, she vanishes from the chair.
That is all I found so far, if you guys found anything else let me know.