So here is a proper list from me.
5) Sunstreaker. Yeah, yeah, I know we already got one, but I'm talking about a proper Streaker. Not just a turned around Sideswipe.
4) Optimus Primal. While the original toy is great, I feel there is plenty of potential there.
3) reflector. Need I say more?
2) Cheetor. I would like to see a better design. It's the 20 year anniversary next year. Should be a no brainer.
1) Dinobot. This guy gave his life, twice, for the better good. How can you not want to give him some update love.
I'd have added some beast machines characters, but let's let the bad past stay in the past.