Follow-up rumour, and even less believable than plastic primarchs.

via anonymous sources on Faeit 212
The Imperium in Campaign 3 (Nids vs Orks vs Imperium Vs Necrons) is heavily Ad Mech and Astra Militarum and less Space Marines (most of them are in the EoT in Campaign 2) so maybe that would be where combined Ad Mech comes in (or maybe even before then to pave the way for the campaign?) Adeptus Sororitas I admit I havent heard anything about where they fit in all this.

I presume the Sisters of Battle which launch lightning strikes and hit and run attacks from their fleet of flying pigs backed by plastic Thunderhawks. The attack signal will be the moon turning blue.

It's just another shard, it's just another shard, it's just another shard... everything will be fine...

News on the Squat rumours.
They're not actually Squats, they're AoS Duardin.
http://natfka.blogspot.co.uk/2016/07/follow-up-on-squats-rumors.html

And absolutely nobody was surprised.

If it turns out to just be some sort of Tzeentch Daemonkin (assuming that the accompanying rules are competitive) then I'll be happy.

Thou it would be a nice bonus of they've paid enough attention to fan feedback to realize fans want more lore consistency and moral ambiguity out of the actual story parts. I know, I know, we all want to believe in miracles.

BoLS are at it again.
http://www.belloflostsouls.net/2016/07/40k-rumors-betrayal-at-calth-sequel-contents.html

So now they're saying the sequel will have the following models.
5x Tartaros Terminators.
1x Praetor/Centurion in Tartaros armour.
10x Astartes in Mk III.
10x Assault Marines in Mk III.
10x Breacher Marines in Mk III.
1x Praetor/Centurion in Mk III with Boarding Shield.

No mention of any particular Legions they'd belong too.
Which makes sense as Breachers don't exactly fit the two BoLS have been championing, SW or TS.

Plus, I do remember something about Mk III suits of armour not being used by Jump-Pack equipped Assault Squads.
If Citadel are doing a HH Assault Squad, I would expect it to be in Mk IV armour. Especially when you consider that they already have the Jump Pack in plastic on the Sanguinary Guard sprue.

I've already ordered the trucks of salt to go with this one!

That was retconed some time ago !Right?

Weren't there rumours about a Battle of Phall sequel? Makes sense with the Breachers and boarding shields.

But does not seem to fit the Assault Squad.