4.8.1 has only fixed some bugs, everything that worked in 4.8 will also work in 4.8.1 as far as I know, you don’t have to fix anything if you already converted your project to 4.8 
4.8.1 is really nice, I can finally package my game without making it crash on startup! Yay!
Unfortunately trees don’t really look nice in a package game because Hierachical Instanced Static Mesh Components are still a “bit” buggy, I guess I have to call this a feature, like “my game is awesome, the trees can make themselve invisible for one frame, special ability!” 
https://.com/watch?v=jpW9IZCd39M