I'm sorry OP but I wouldn't hold my breath for good news. There's no reason they would deliberately keep the 'real' look of the snow secret in the trailer. The most logical thing is that what we see in the trailer is what we get.
I'm happy to be proven wrong though - snow is big part of a seasons expansion, and if it's as badly looking as it is in the trailer, then it's make or break for me with this pack. No matter what wonderful features we get, it's a hard thing to overlook for me. Hope is a good thing, but in this case it's a bit naive.