To everyone hoping for proper Technobots, don't count on them just yet. Scattershot is indeed Onslaught's Wave 1 case mate and since Wave 1 is focusing on Combaticons, and Wave 2 is focusing on Sky Reign, there's no place for them. Plus, Betatron has already been revealed at SDCC2015 with these "official" limbs:

Official art and all. That's it for Hasbro's side. However, TakaraTomy may do more with him, all retools at the very least. I could see Lightspeed from Wheeljack, Afterburner from Groove... maybe Nosecone out of Brawl (drill tanks are quite common in some Japanese series) and Strafe from new-mold Blast Off?
@SillySpringer: Motormaster will receive or has received a so-called running change for Voyager Wave 4: he's Battle Core Optimus Prime's case mate. So he'll receive the fixed ratchets too, as well as, hopefully, the future Unite Warriors Optimus Maximus.
By the by, does Unite Warriors Grand Scourge have them too?
The resident Rewind... well, half of one

- Jelze Bunnycat =:3
Looking for:
- TR Furos (Hardhead's head) and Crashbash (lost him

)
- PotP Punch head
- TR Galvatron right arm (the gun one)
- CW Brake-Neck/UW Wildrider, CW Offroad
- TR Twinferno & Grotusque
- Greenlight, Lancer and PotP Elita-1
- Legacy Core Slug, Sludge & Snarl