Love seeing the various elven armours: both the trailer and the BTS video show the Eregion elven warriors with the gold and turquoise green helmets, and deep green capes / outfits. This type was briefly seen in Season 1 when Galadriel brought Halbrand to Eregion when he was ‘wounded’ by eruption / creation scene of Mordor. When they arrive outside a courtyard, several of these good / green elves assist in carrying him inside. Overall - this type of outfit has something of a creative flair about it (bright, almost lurid green, and gold mottled helms - as well as softy garment, furnishing over armour) not dissimilar to Celebrimbor’s green outfit. These elves are also seen drawing their swords on Annatar’ / Sauron (Charlie Vickers’).
pic below:
The second type of armour, is the one seen mostly in the BTS vid: silvery, grey armour, with a crest in the helm (with segmented connecting struts / supports inside the cavity of the crest). I think this is the same armour that was seen in an earlier leak, months ago now - which shows two elven horsemen, with leaf motifs on their shields, and horse armour. The BTS vid shows an elf spinning in slow motion with their sword, battling orcs in a forest scene / background foliage. This armour type is also shown in a clip, with elven warriors running across a battlefield, with fortress / castle / elven city walls in the background - and camera crew filming in the foreground.
pics below:
The third type of armour shown, appears to be similar to the previous, but with more green cloaking, and a silvery green helm, which has a pointed, sharp crest, with no supporting struts (a hollow cut-out). This type of helm could be also what Elrond is seen wearing in closeup (with dirt on his face, and wearing a green cloak with an elvish broach / clasp. Because the shot cuts off the top half of the helm, it’s difficult to tell exactly what the helm looks like.
pics below:
There’s also a fourth brief armour scene in the BTS, showing Galadriel and Elrond, in a forest [Birches / Lindon?], and there’s a guard with a burnished gold helm and armour. This appears to be Lindon guard armour, as seen in Season 1 - but with a tall two piece knife like crest which joins a vertical point. I don’t recall seeing this type of helm on this guard
pic below:
Outside of these armoured elves, we also see the ranger-type elves with Galadriel and Elrond, in the [possible barrow-wight].
That’s all I’ve got at the moment - will try and grabs some screenshots and add shortly!