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In FFXI, crystals appeared, in part, as eight elementals which could be used as a source of energy. In FFXIV, Sato revealed, crystals will appear as part of an idea known as the "Banbutsu no Kagayaki." They will be a required element for livelihood, and will also give players power. Sato's response to Famitsu's question about Crystals was pretty vague, so this is presumably something that Square Enix will detail in full in a future update.
The rest of the Famitsu interview covered some of the key terms in the prologue, first of which are the "Banzoku" and "Banshin."
The "Banzoku" (temporarily translated as "savages" until an official English name becomes available), look physically different from humans (more so than the current cast of revealed character class types). Images in Famitsu make them look like tall alien creatures with broad arms and a frightful face.