All "New Classes" threads eventually concede that getting new classes in the game is a pipe dream because of the monumental amount of work it would take to script and voice entirely new Class Stories, but there is still a chance to see new "classes" . . . Advanced Classes!
New Advanced Classes added to the current 8 classes wouldn't need new Class Stories, they'd go through the same ones the other 2 Advanced Classes share.
So, here's my ideas . . .
Jedi Avenger - a Double Bladed Sabre using Jedi Knight ... Medium Armor tank and dps trees.
Sith Destroyer - a Double Bladed Sabre using Sith Warrior ... Medium Armor tank and dps trees.
Jedi Archon - a Dual Wielding Jedi Consular ... Light Armor heal and dps trees.
Sith Harbinger - a Dual Wielding Sith Inquisitor ... Light Armor heal and dps trees.
Squad Leader - a pistol using Trooper ... Heavy Armor heal and dps trees.
Ranger - a rifle using Bounty Hunter ... Heavy Armor tank and dps trees.
Scout - a rifle using Smuggler ... Medium Armor tank and dps trees.
Fixer - a pistol using Imperial Agent ... Medium Armor heal and dps trees.
EDIT: my post isn't so much about actual new advanced class ideas so much as it's about "how do we get new classes introduced" . . . anyways made a couple tweaks to my ideas.