Headmaster Laser Prime which looks to be inspired by both Star Convoy and G2 Prime.
Headmaster Triplechanger Megatron which can turn into a jet and a tank. Will probably be used for Blitzwing.
Getaway as a repaint of Chromedome.
Headmaster Triggerhappy (his G1 toy was a Targetmaster).
Headmaster Hot Rod
Headmaster Triplechanger Alpha Trion (while we have seen the art for this toy, Chainclaw did expand on the vehiclemode looking like Vector Prime's).

Transformers Convention & Club Exclusives Alpha Trion Gallery
Headmaster Weirdwolf
Headmaster Doublecross
Magnus Prime, which is a blue redeco of Combiner Wars Ultra Magnus, as a reference to the Diaclone Ultra Magnus.

Transformers Generation One Diaclone Ultra Magnus (Movie Preview Version Ultra Magnus) Gallery
Tidal Wave which may share the mold with Broadside. Probably a triple changer and thus a voyager headmaster.
Decepticon Clones made up of components looking like the Predaking ones. For example there was a Horri-Bull which could double as Tantrum.
Legends Sharkticon (Gnaw)
Legends Reflector (Shockwave redeco)
Legends Kickback
Legends Brawn
SDCC Fort Max comes with Red Sword. This was already hinted at in a previous leak which mentioned an exclusive sword.
Here is the detailed breakdown with extra descriptions and thoughts on what Chainclaw saw:
Chainclaw wrote:An anonymous friend of mine showed me a bunch of stuff on his computer last night that Hasbro is working on. A couple things were just concept art, or those packets they show investors. But the majority was actual toys. Anyways, he said I could talk about it online, as long as I didn't mention him by name.
So that said, it would be great to have some images, to represent what I saw when I'm talking to people. So I have a series of requests that are spoilers of what's coming later in 2016 and 2017. So anyone not wanting to know shouldn't read past this point. Cool?
Okay, I saw a Headmaster Star Convoy / Laser Prime from G2. It pretty much looks like Star Convoy, except that star-ish shaped yellow thing on his chest looks blockier, like a letter T. And his shoulders are very Laser Prime, sticking up high, with two circle things on the front of each one. In truck mode he's long nosed, but red. Not black with red flames.
Just as Sentinel Prime was obviously Astrotrain, Headmaster Megatron is obviously Blitzwing, but with a Megatron head. You can see his tank turret on his back, and jet fins on his ankles. He comes with two guns which merge to form his big cannon that can plug into his arm. Megatron's head looks very G1 in head mode. In "Nebulon" mode it has a red torso, and grey limbs.
Chromedome's getting repainted as Getaway. Head looks G1.
Triggerhappy is a headmaster who looks very G1.
Hot Rod is a headmaster who looks G1 in vehicle mode. Robot mode looks vaguely IDW to me. Small waste. Long thinghs. Big hexagonal kneepads with vents in them.
Alpha Trion's a triple changer. Beast Mode is a wolf with a unicorn horn (I have no idea why). Jet mode looks very Vector Prime.
Weirdwolf looks good. Very G1.
Powermaster Prime is getting a Diaclone repaint, so it's a blue COE truck. They seem to be calling it Magnus Prime or something along those lines (I can't remember for sure). Odd, since it's not white.
Tidal Wave seems to be coming back (investor art, photoshopped, rough). Looks like it'll share a mold with Broadside. Vehicle mode seems to be USS Flagg homage. Part of "strength series". Tidal Wave's head is called Powerhouse. Grey body. Green limbs.
Decepticon Clones. Looked to me like they have a Predaking. And the D-clones were Predaking parts. Same with Horri-Bull.
Sharkticon looks very round and G1.
Technobots look like you'd expect. But Afterburner is weird. Instead of making him G1, or just an orange Takara Groove, he's got this really long warped/bent windshield. It looks awkward to me. But that was my only complaint from everything I saw.
SDCC Fort Max comes with red sword. Has blue hands, instead of white.
That's all I can remember right now. Anyways, very excited. Would love to have any of these done up, just for the sake of chatting with friends about it on FB, etc.
Thanks-