Standard Disclaimer: I'm not a mod, none of this is final, etc.
For everyone wondering how the classes matched up to their names, and hasn't seen the chart here (and because I find the chart hard to read), Here is a list of the classifications and specifications available in the game:
COMMANDER -- CROWD CONTROL
Brigadier -- Control / Assault
Director -- Control / Support
Executor -- Control / Ranged
RANGER -- RANGED DAMAGE
Hunter -- Ranged / Manipulation
Partisan -- Ranged / Support
Gunner -- Ranged / Defense
GUARDIAN -- BUFF / DEBUFF
Sentinel -- Support / Ranged
Warden -- Support / Manipulation
Vindicator -- Support / Assault
ENFORCER -- MELEE DAMAGE
Gladiator -- Melee / Defense
Striker -- Melee / Manipulation
Bodyguard -- Melee / Support
STALWART -- TANK
Bulwark -- Defense / Melee
Centurion -- Defense / Manipulation
Bastion -- Defense / Assault
OPERATOR -- PET SUMMONER
Engineer -- Pets / Support
Taskmaster -- Pets / Assault
Ringleader -- Pets / Manipulation
Your classification (in caps on the list) determines your primary powerset and your general role on a team. Your specification (in lowercase, beneath the classification) determines your secondary powerset.
For those of you unfamiliar with CoH terms, an Assault set contains a mix of melee and ranged powers, and a Manipulation set contains a grab-bag of attack, control, and self-buff powers.
People are planned to have access to additional powers in the form of tertiary powersets, working like power pools in CoH. These are planned to include slimmed-down versions of other primary or secondary sets. For example, to make Superman, you can take Superstrength and Invulnerability as your primary and secondary sets, then pick up Energy Blast as a tertiary set to get eye-beams.
Finally passive abilities, like Brute Fury or Tanker Punch-voke are planned to be a choice of three per Classification, and are planned to be decoupled from Specifications. So (hypothetical example) any of the three Enforcer specs can choose between Scrapper Crits, Brute Fury, or Stalker Assasination.
The world is a mess and I just ... need to rule it.