Players of the Dark Souls III Network Beta have revealed some information from the parts of the game that have been playable. I was able to play the Dark Souls II open network beta a few years ago, but I missed the beta for III. So I haven't seen any of this information first-hand; I'm going off what I've read and seen from the internet. Anyway, according to the Dark Souls III wiki on fextralife, there are gravestones throughout the game that have epitaphs that provide some amount of game lore (similar to the lore notes from Bloodborne). One of these gravestones apparently says "Grave of a nameless retainer. Raised his sword for the Lord of Cinder". This is one of several references to the Lord of Cinder that are present in Dark Souls III.
The following blog will speculate as to the identity of this "nameless retainer" and the Lord of Cinder mentioned in the Network Beta test. This is only an educated guess being made by a fan a month prior to the game's release, but it may contain significant possible spoilers for Dark Souls III. There will also be spoilers for the previous Dark Souls games. Read ahead at your own risk.
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Tags:Dark Souls, Dark Souls III, Lord of Cinder, Kiln of the First Flame, Gwyn, Solaire, Furtive Pygmy, player character, gravestone, epitaph, nameless retainer, ember, Hidetaka Miyazaki