This list isn't thoroughly thought out, but I kind of liked the general idea of how EQII did classes/subclasses. This is my take on that. I'd like to see multi-classing ability within a specific archetype (rogue/priest/caster/tank) and alignment (good/neutral/evil).

Casters:
Summoner (pet class) - good/neutral -- [summons elementals]/[summons monsters]
Cultist (crowd-control) - neutral/evil -- [curse-based spells]/[necromancy]
Arcane (nukes) - good/evil -- [fire & air]/[earth and ice]

Rogues:
Thief (utility) - good/neutral -- [bard-like with utility]/[swashbuckler, flashy moves, lots of utility]
Assassin (melee DPS) - evil/neutral -- [poisons, stealth]/[burst damage, gadgets]
Ranger (ranged DPS) - good/evil -- [animal companion(s), bow/melee auto-attack]/[traps, bow/melee auto-attack]

Tanks:
Knight (armored tank) - good/evil -- [paladin]/[shadow knight]
Monk (avoidance tank) - good/neutral -- [tranquility: less dps in favor of amazing avoidance. no auto-attack]/[patience: dps with precise burst damage attacks. no auto-attack]
Berserker (DPS tank) - neutral/evil -- [axe-throwing, AE melee damage]/[leaps to target, AE melee damage]

Priests:
Cleric (reactive heals and AC/HP buffs) - good/evil -- [courage]/[fear]
Druid (heal over time and haste) - good/neutral -- [plant-based]/[storm-based]
Shaman (ward healing <see EQII> and debuffs) - neutral/evil -- [ancestral/spirit-based]/[poisons/disease]

No thanks, I was just laying out the most likely plan for the EQ Next devs =)

Personally I'd fix the ranger as a class and try to make the class a true archer with some melee capability. I'd use talent trees (basically AA's) to give rangers focuses:

1) Archery/Scouting
2) Nature magic/knowledge
3) Defensive melee, disengages

Main points:

PVE - Most rangers know that you can pretty much kill anything that can be snared in classic eq, but its boring. I'd rather have a situation where a ranger needs to set up and use cover to aim a major shot that can either kill an easy opponent out right or severely wound a harder opponent (like a dark blue) then the ranger could use their faster shots, nature magic and limited melee to finish off an opponent. A moving opponent has a much higher miss check than one who has stopped. A ranger that misses this sniper shot would have a much tougher time killing an opponent.

Group role/raid role - I wouldn't want rangers to have "tank" abilities so when I say defensive melee I'm talking more slash their eyes and jump backwards or blade shield stuff. Their group role would be using their big shots to finish off targets and defensive skills to pry things off healers/casters... not to be tanked but to give them a moment. In a raid I'd make rangers gain knowledge of raid targets based on type and how often the ranger has attacked said target type. This knowledge would allow a ranger's sniper type shots to debuff raid targets for short durations in a unique way.

Just in general, I would :

1. Make death extremely painful. Large exp loss, possible character degrades and difficult and necessary CR.
2. Have nearly all gear wear out and break eventually unless repaired.
3. Not have instances.
4. Implement 'classes' through basic archetype selection and then exclusive skill trees, with skill levels via usage.
5. Implement actual weather with real effects.
6. Make world travel a pain in the ass. No automatic transporters.
7. Make mobs smart and deadly.

Then, when like only two people want to play, throw it all away and make a shiny wow clone.

i hope they have corpse runs and very very very slow mana regeneration