I am very excited for Archetypes and would like to share some things I would like to see.
Paladin - Blackguard. Dark Paladin with Harm spells and undead summons. (With Vanguard and, if left to Wizard - Pale Master, otherwise, the Fighter's Stalwart Defender Tree in place of Sacred Defender.)
Barbarian - Battle Rager. Shield Barbarian with retribution damage. (With Ravager and Vanguard)
Fighter - Swashbuckler. Evasion/Intelligence tree (With Kensai (with only a selector for Swashbuckler Weapons) and the Bard tree that replaces Swashbuckler.
Bard Swashbuckler replaced with a Performance-based physical damage tree about self-buffs themed to thrill-seeking, and dramatic combat maneuvers.
Arcane Archer made into an Archetype and replaced with a physical damage ranged tree. Arcane Archer tree, Ranger ranged damage tree and Kensai (Longbow/Shortbow selectors only.)
Wizard Pale Master and Eldritch Knight trees replaced with something like a school-based version of what Sorcerer has for Elements. Every tree buffs spell power plenty for damage spell progression, but otherwise, it's a tree for each of Conjuration, Transmutation, Divination and Enchantment.
Conjuration tree focused on summoning and obstruction.
Divination is focused on Utility.
Enchantment is focused on... Enchantment? ENCHANTMENT!
Transmutation is based on transmutation... Buffs, really.
I think this would open up Wizards to help with creation of Archetypes and also flavor within those Archetypes while keeping Wizards thematic to what a Wizard is.
Eldritch Knight made into an Archetype for Wizard. Eldritch Knight Tree, New Transmutation Tree, and Stalwart Defender.
Pale Master made into an Archetype for Wizard. With Pale Master (being the Necromancy variant of the other school-themed trees focused on necromancy and defense,) The full selection of other School-themed trees and... I don't know... Vile Chemist?
Rogue - Spell Thief. The Wizard's "missing" Abjuration tree focused on thwarting enemies and debuffs. With the Acrobat tree and the Bard's Performance-based tree.
Rogue Mechanic changed into a Batman tree.
Thief Acrobat changed to just Acrobat (It doesn't have anything that helps with theft) and given multi-selectors for Stick or TWF w/ Kama/Kukri where currently there is only Stick bonuses.