Elemental stones in the pony movie?

[Steve Piranha 28,741]

I remember some leaked mails regarding the pony movie years before it was released. Cosmos is well known by now, but I think there were some elemental stones as well. Am I right, or I’m just remembering things wrongly?

[Sky Serenade 60]

Well, since I have nothing else to do...

 

While I'm not entirely sure if "the Elemental Stones" you are mentioning was one of those scrapped ideas they had since I don't think it's on the wiki. If it were, they might be referring to the Elements of Harmony. It could be that they were thinking to make the Elements of Harmony to have their own power connected to the elements. Like Applejack's Element of Harmony could have been connected to the Earth element, and maybe Dash's connected to the Air Element and so on. Sounds like a nice idea for a fanfiction though, better add to the list...