The changes essentially boil down to the following:
you can specify a folder to download to (both curseforge mods and url mods) using "folder": "name" e.g. "folder": "resourcepacks" will download it to resourcepacks. "folder": "." is what you would use if you wanted to download something directly into the .minecraft folder.
you can specify if ModDirector will try to inject a mod. If it is "inject": "false", moddirector will not try to inject it no matter what. Useful for mods like that one that allows you to add custom items that required mozilla JS files inside the mods directory. "inject": "true" will try to inject no matter what (note: if the mod is not located inside the mods folder, forge will ignore it anyway). Omitting the line will default to the following behavior: Try inject if inside mods folder, don't try inject if outside mods folder.
The changes essentially boil down to the following: