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The top-level combiner molds are listed in wave order then alphabetical. Victorion legs unknown at this time so they aren't included.

Legends
- Powerglide
- - Viper [new head]

- Blackjack
- - Rodimus [new head]

- Groove
- - Wreck-Gar [new head]
- - unnamed Victorion chest [unknown]

- Shockwave


Deluxe
- Alpha Bravo
- - Blades [new head]
- - Vortex [Alpha Bravo repaint]
- - unnamed Victorion arm 1 [unknown]
- - unnamed Victorion arm 2 [unknown]

- Drag Strip
- - Mirage [new head]

- Firefly (aka Fireflight)
- - Quickslinger (aka Slingshot) [new head]
- - - Blast Off [Quickslinger repaint]

- Skydive
- - Air Raid [significant remold]

- Breakdown
- - Sunstreaker [new head]
- - Wheeljack [significant remold]

- Dead End
- - Brake-neck (aka Wildrider) [new head]
- - Streetwise [significant remold]
- - - Prowl [new head on Streetwise mold]
- - - - Smokescreen [Prowl repaint]

- Offroad
- - First Aid [significant remold]
- - Ironhide [new head]
- - Trailbreaker [new head, new right forearm]

- Rook
- - Swindle [significant remold]
- - - Hound [new head on Swindle mold]

- Groove [Takaratomy new mold]

- Brawl


Voyager
- Optimus Prime
- - Motormaster [significant retool]
- - Battle Core Optimus Prime [new head]

- Silverbolt
- - Cyclonus [significant retool]

- Hot Spot
- - Onslaught [significant retool]
- - unnamed Victorion torso [unknown]

- Sky Lynx


Titan
- Devastator
- - Takaratomy Devastator [remold, new accessories]


Out of the Hasbro releases, that's 18 original combiner molds (4 Legends, 9 Deluxe, 4 Voyager, 1 Titan) making up 48 figures across 6 waves.

UPDATED WITH SDCC INFO

Legends
- Powerglide
- - Viper [new head]
- - G2 Powerglide [repaint]

- Blackjack
- - Rodimus [new head]
- - Blackjack [G2 repaint]

- Groove
- - Wreck-Gar [new head]
- - Rust Dust [repaint]

- Shockwave


Deluxe
- Alpha Bravo
- - Blades [new head]
- - Vortex [Alpha Bravo repaint]
- - Stormclash [remold]
- - - Skyburst [new head on Stormclash]

- Drag Strip
- - Mirage [new head]
- Drag Strip [G2 repaint]

- Firefly (aka Fireflight)
- - Quickslinger (aka Slingshot) [new head]
- - - Quickslinger [G2 repaint]
- - - Blast Off [Quickslinger repaint]
- - Firefly [G2 repaint]

- Skydive
- - Air Raid [significant remold]
- - - Air Raid [G2 repaint]
- - Skydive [G2 repaint]

- Breakdown
- - Sunstreaker [new head]
- - Wheeljack [significant remold]
- - Jumpstream [remold]
- - Breakdown [G2 repaint]

- Dead End
- - Brake-neck (aka Wildrider) [new head]
- - - Brake-neck (aka Wildrider) [G2 repaint]
- - Streetwise [significant remold]
- - - Prowl [new head on Streetwise mold]
- - - - Smokescreen [Prowl repaint]
- - Dustup [remold]
- - Dead End [G2 repaint]

- Offroad
- - First Aid [significant remold]
- - Ironhide [new head]
- - Trailbreaker [new head, new right forearm]

- Rook
- - Swindle [significant remold]
- - - Hound [new head on Swindle mold]

- Groove [Takaratomy new mold]

- Brawl


Voyager
- Optimus Prime
- - Motormaster [significant remold]
- - - Motormaster [G2 repaint]
- - Battle Core Optimus Prime [new head]

- Silverbolt
- - Cyclonus [significant remold]
- - Silverbolt [G2 repaint]
- - Scattorshot [significant remold]

- Hot Spot
- - Onslaught [significant remold]
- - Pyra Magna [remold]

- Sky Lynx


Titan
- Devastator
- - SDCC Devastator [new head]
- - Takaratomy Devastator [remold, additional accessories]

My list needs adjustment as Jumpstream, Pyra Magna, and Dustup have more new parts than just new heads. Jumpstream has a new chest, new forearms, and a new head, and Dustup uses that plus a different new head. Pyra Magna has a new head and combiner head but also new forearms and a new chest.