There's not as much to talk about with G4 as there is for the earlier gens (IMO) because we know basically everything about it! There's no big mysteries, prototypes, etc like with the earlier gens. Everything's already neatly catalogued and documented.
Don't really agree with this, no offense - I still find myself learning new things about G4, and might even see new things revealed about it (I'm not sure if they're revealed, or I just saw them late, but it's probably the latter), and we don't know for sure if everything has been revealed yet, so there could be so much out there we haven't seen...
Regarding prototypes specifically, I know that G4 had a
lot of them. Usually ponies with different symbols/cutie marks than generally expected, being a different pony type, etc. rather than entirely unique characters. Many have been documented, but I wouldn't be surprised if some slipped through the cracks and we ended up discovering them in the future.
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