There have been a lot of rumours circulating the interwebs and I thought it would be best to list down what we know so far and what is and isn't supported by any evidence. The unsubstantiated rumours come from a 5 minute section of the
Transmission Podcast, episodes 114-123. I personally listened to these podcasts to see what was behind these rumours and it turns out that a fan of theirs claims to have seen prototypes of toys in pictures (they themselves are not a Hasbro employee but probably have a contact there) and builds assumptions off these, and then sends the info (not the pictures) to the podcast under the very original name "
deepthroating". I have listed everything of importance below, saving you a few hours of repetitive sexual innuendos. The last section of this will detail the rumors that did not pan out for 2015 just to give an indication at the how many grains of salt you should take with these rumours (being Canadian, this is how we will be spelling that word this evening, spell check be damned!).
Rumours Substantiated by some evidence:
Titan Class Fortress Maximus, this should be the only titan class figure coming out in 2016 and it will have a double headmaster as the G1 toy did.

An Astrotrain-like Transformer with a headmaster looking like Optimus PrimeA Leader sized
Headmaster of Blaster which also has a base mode. Several smaller casette-type Transformers (we could call it more like a communication device) will be released which can fit inside the chest. The upcoming Buzzsaw is one of them and we also have listings for
Autobot Stripes and Rewind.


The fact that we have listings for both Decepticon and Autobot casettes could mean that Blaster could be redeco'd / retooled into Soundwave.
Other Headmaster Transformers will be available and their smaller headmasters will be able to interact with smaller vehicles made for them, along with the base modes (such as the one of Fort Max and Blaster). The class for the little headmasters which may be bought individually, are rumored to be called "Titan Masters".
Rumours Substantiated by no evidenceThese are all from the aforementioned podcast.
Deluxe Cybertronian Scourge with titan master (I think it will be a target master)
Deluxe Cybertronian Blurr with titan master (I think it will be a target master)
Headmaster Sentinel Prime and Galvatron who transforms into his G1 Alt Mode
A retool of Leader Ultra Magnus as Powermaster Prime. He will also be a headmaster and have a base mold. Someone posted an image of how that could work given the Leader Magnus mold:

Alpha Trion with beast kibble found on his robot mode. He should also turn into a ship.
The following "cassettes": Rumble and Frenzy
The following Headmasters: Brainstorm, Chromedome, Hardhead, Highbrow, Nightbeat, Siren, Horribull and Skullcruncher. These are supposedly labeled as Deluxes and will come with both a headmaster and another transforming figure which can interact with the titan masters. These smaller accessories have vehicle and beast alt modes.
Rumours for 2015 that did not pan outI will now list the rumours at the begining of the year that didnt turn out to be true:
Hotspot would be a retool of the Optimus/Motormaster mold
The Constructicons would be MPs when released by Takara
The Constructicons would be released individually in Japan
MP Tank Megatron
MP Ratchet
MP Shockwave
MP Blitzwing
MP Galvatron
And of course, let us not forget the G1 reissue of the Dinobots and how well that turned out.