We all know of one Raid so far, the Vault of Glass, but some newer members may not know of a [b][u]potential[/u][/b] second Raid. It was introduced to us quite some time ago, and I (because of this) think that most Raids, if not all, will be Vaults.
The second Vault we know of, and by that (potential) logic Raid, is Charlemagne's Vault.
Mind you, this is all speculation right now, but it seems likely.
Also, if you enough people need me to explain who Charlemagne is/was, I'll update the OP with information.
In Destiny, Charlemagne is what is known as a Warmind. Warminds are vastly powerful war machines built by the Traveler (Charlemagne is on Mars). The Warminds created the Exos before the Darkness attacked. They seem to have helped us with our defenses during the Collapse.
Ad astra.
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This is going to be epic in a scale that words cannot describe. Will you be waiting for guardians inside the vault with a trick question? :)