These rumours mostly concern the last part of the trilogy, Power of the Primes which is due out in stores January 2018, but there is also mention of Titans Return since there will possibly be transition figures like Buzzsaw in Combiner Wars.
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Prime Wars next Gimmick is toys to life. Download an App and scan the card that comes with the figure onto your iphone. Play "stages"(it's unkown what type of game it's going to be) using said character.
Titanmasters will be replaced by equally smaller guys. They won't be headmasters but closer to Micromasters that become target masters or weapon platforms.
Legends will still be able to cart the tiny men around
Prime Wars will still be mostly 88-89 crew. Things like Turbomasters will show up from time to time.
All 5 Dinobots will be made as well as the remaining 3 insecticons will appear. Ransack will show up towards the end of TR as will Barrage. Venom will either be Wave 6 of TR or Wave 1 of PW. He's like Buzzsaw in CW where he may not be able to fit into wave 1.
Scorponok will be Next Titan after Trypticon
TR Arcee is just a repaint of TR Loudmouth