With the number of changes in the previous thread, I'd just call it 6e
In all seriousness, I think accessibility would still be desired in New 5e so adding a decimal or the word "advanced" could turn newcomers off. I wouldn't want to start in anything that has the word "advanced" in it unless it always had it like Advanced Wars and I definitely wouldn't feel welcome in D&D 365d20/2 redux remix definitive edition like in Kingdom Hearts.
I'd probably call it D&D 5th Edition Expanded. Acronym 5ex.
Oh god, I just realized that looks like sex. Well, back to the drawing board