
Akihiko Matsui said:
Greetings, adventurers! Matsui here with a sneak peak at the upcoming forum later this week. Not only will we be seeing the release of a new expansion titled, "Masters of the Mask", but we will be seeing the premier of the highly anticipated new job, Mime!
Mime, the Master of the Mask

Details
Mime has access to all of the player's unlocked job abilities, spells, and traits.
Configuring your Mime can only be done in the Mog House and cannot be changed when outside. This requires players to plan appropriately according to their planned events.
Mime 1 hour abilities:
Conjuration Mimic - Level 1 - Will copy the most recent spell cast by either a party member or an enemy on the hate list.
Somatic Mimic - Level 96 - Will copy the most recent Job Ability by a party member or the most recent enemy ability from an enemy on the hate list.
Job Abilities
Mime can pick 8 of any of the following:
1 Job Ability*
1 Summoning Magic Spell
2 Ninjutsu Spells
2 Blue Magic Spells
2 Geomancy Spells
3 White/Black Magic Spells
3 Songs
*Phantom Roll is limited to 1 roll. Rune Enchantment will only have 1 Rune unless up to 3 Job Ability slots are used for a total of 3 runes. No 1 hour abilities are allowed.
Job Traits
Mime can pick 14 of any Job Trait to set. Increasing the tier must be done with another "slot".
For instance, if you were to set Dual Wield IV, you would need to use four Job Trait slots for Dual Wield.
Skills
Mime can choose which combat skill to be associated to each the following: A+, A, B, C, D, E
Mime can choose which magic skill* to be associated to each the following: A+, A, B, C, D, E
*Singing, String, Wind magic skills may not be set above a C.
Equipment

Mime has access to every single piece of equipment in the game, yes, this includes Relics, Mythics, and Empyrean weapons and armors.
Special
Due to the highly configurable nature of Mime, when setting Mime as your Main Job, you will not be able to set a Support Job.
Basically WoW's Death Knight.