So far we have seen the following armor sets in the trailers and previews
-http://www.egmnow.com/wp-content/uploads/2012/05/skyrim-dawnguard.jpg (unknown if obtainable)
-http://www.inentertainment.co.uk/wp-content/uploads/joining-dawnguard-skyrim-dlc.jpg
-http://images.g4tv.com/rimg_606x0/ImageDb3/300181_l/e3-2012-skyrim-dawnguard-screenshots.jpg
-http://www.heyuguys.co.uk/images/2012/06/Skytim-Dawnguard_8.jpeg
-http://oyster.ignimgs.com/wordpress/stg.ign.com/2012/05/Untitled-10-610x343.jpg

Have you noticed any other armor sets?

nope , but nice work