For now I guess I'm looking forward to Miraak's gear. Hard to judge any of the other potentially new armour in the trailer.
My least favourite in vanilla is probably ebony. It doesn't need a total redesign or anything though, its just that helmet that messes things up.
You're spot on about the ebony helmet,especially the look from the back.
The actual design of ebony armour isn't to bad,it's just bland and colour-less. Morrowinds ebony armour was awesome,especially the helmet.
I'm not a fan of light armour in skyrim at all really. Hide,studded,and scaled are all too similar/copy paste. Glass looks good and elven is ok also,even more so if combined with glass.
And don't get me started on the light armour helmets ( with the exception of glass and elven ),they are just awful. There is also a severe lack of hoods in this game. I shouldn't have to join a faction to obtain one. They should be in shops and different colours,to match other armours. Linwe's hood design is by far the best. That type of hood ( and others ) should be available to buy in different colours. More ranger type clothing ,armour,gear is called for.
I'm looking forward to the old armour's also. Like many others,i would love to see indoril and Dreugh armour also.