This discussion may be updated as time goes on, but here are some ideas that ArenaNet could employ going forward:
Elite Specialization = ES
Warrior (ES: Battle Master)
No need for new weapons, but instead the addition of Elementalist-like Attunements (possibly called Attunements or Battle Stances). There could be 2 or 3 Attunements (i.e. Offense/AoE, Defense/Mobility etc.) which the Warrior could swap to (using F1 and F2 like the Elementalist) that changes the weapon skills of the currently equipped weapon. Just like the Elementalist, the Warrior would only be able to use 1 weapon during combat, and swap to another when out of combat. The Utility skills could be Preparation-type Utilities, where you would activate a skill that would unleash its ability once you have performed a specific action (such as dodge, go through the entire auto-attack chain or launch a foe). This would require adding many new skills to the Warrior's arsenal, but it was successfully done for the Elementalist, and I think this sort of gameplay would liven up the arsenal of abilities Warriors use to obliterate foes. New Greatsword skills to swap between on the Front and Backbar would be an incredibly welcomed change. Maybe even shuffling some of the current skills between the Attunements and then adding some in between may help.
Revenant (ES: Shatterer)
Give this Profession the use of a Greatsword, have it a mix between melee combat, and have it a power-based Profession. The Legendary Stance could be one that emulates Balthazar.
Elementalist (ES: ----)
The Elementalist loses the use of a user-defined Attunement (chosen in in the Build menu) to enhance other abilities (loss of water = vulnerability and slows on certain skills with possibly some healing on others | loss of fire = might buffs and burning on certain skills | loss of air = stuns, swiftness and knockbacks on certain hits | loss of earth = protection and bleeding on certain hits) and possible extra passive bonuses. The Elementalist gains the use of either Dual Axes or the Longbow as the new weapon for the elite specialization. The Utility skills could mirror the chosen 'lost' Attunement: they could be called Sigils or Marks and the Sigil or Mark would change use based on the aforementioned Attunement loss.
Please comment and add.