I think in one of the scenes shown in the new video, it was a dark evening and it's snowing, the snow flakes in the air are big glowing balls? I remember it's also the same way in Oblivion. Maybe it's just dev's artistic exaggeration, but I would love to see more realistic snow effects, not just accumulation but how it looks in the air. how do you feel about this type of snow?
example of glowing snow in skyrim:
http://throwmeaway.imgur.com/tes_v_skyrim__hi_res_stills_from_feb_24_trailer#AE21E