I think everything will stay the same even MIUI is upgraded to v8. Mi3, Mi4 with KitKat. Minote and minote pro maybe get Lollipop after Android M is release. Simply, that's Xiaomi strategy.
Basicly MIUI7 is just MIUI 6 with theme. So don't expect too much.
Also, translators need time to move strings from MIUI6 to MIUI7.
You can help them by not saying anything until it out