40k Emperor's Children Render Teaser

[LSM]

On the armour marks, there was a 2021 White Dwarf HH article Armour Through the Ages had this to say about the respective Marks and their Chaos associations:

• MkIII: "...The same has been said of the Death Guard, who favoured grinding and relentless frontal assaults for which Iron Armour was especially well suited. So well suited to the singular mien of the sons of Mortarion was Iron Armour that in ages to come it would become synonymous with their fall, for it would serve as the basis of the heavily corrupted and debased power armour worn by the vile warriors even now becoming known as ‘Plague Marines'."
• MkIV: "...The Thousand Sons Legion, however, appears to have adopted the mark later in the Horus Heresy, though how and why remains beyond our ken at the time of this study. In the years after the war, the Thousand Sons would manifest the dreadful ‘Rubric Marines’, who, according to accounts, appear to be almost universally equipped with a highly ornamented variation of Maximus Armour, making the mark now synonymous with the sons of Magnus the Red."
• MkV: "...Likely due to the relentless pace of operations, one Legion in particular made especially heavy use of Mark V towards the end of the war: the World Eaters. Of all the Traitor Legions, the sons of Angron were committed time and time again to the most high-intensity assaults, and so the Legion’s Techmarines and attached Mechanicum adepts were ever forced to make do with the armour components at hand, especially once the World Eaters ranks began to be rapidly replenished with those referred to by some sources as Inductii. Indeed, so prevalent was the use of Mark V amongst such warriors that the Legion’s red-clad berzerkers, dedicated wholly to the so-called ‘Blood God’, would use it almost exclusively in the wars of the Scouring and beyond."
• MkVI: "...Like so many of the other marks of power armour, Mark VI would come in time to earn the dubious honour of being associated with the ranks of one particular Traitor Legion. In this case it would be the Emperor’s Children, who have been observed to field troops who are evidently the descendants of the dread Kacophoni. These fallen Legionaries have come to be known as ‘Noise Marines’, and they appear to favour a heavily debased and corrupted variant of Corvus Armour, though what characteristics made that mark more suitable for that role than any other remains a mystery to our order."

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Also, the Index Astartes pre-Heresy armour images (from ~2001) were quite comfortable showing MkVI with trimmed pauldrons (as well as what we'd consider MkV style chest pieces):