If you log into the current AvA arena the game will auto-download both the new Aveatow winter terrain and the new ETO winter texture pack. Once you have the texture pack the TE will recognise it and you can select it like the other three texture packs; ETO summer, PTO and Med.
The new winter texture pack has clutter like huts and trees covered in snow, which looks much more realistic than the summer ETO pack. In the summer pack the snowy areas' clutter is the same as the rest of the terrain, i.e. no snow on the trees.
The reason for my wish is that I have a part-built summer ETO MA terrain that I began during AH3 beta testing to help test the TE. One feature of this terrain was several high alt areas covered in snow set up for GV battles. However I wasn't very happy with the lack of snow on the trees, it just looked wrong. This and the need to update CraterMA at the time meant I put it away for later. I have vague plans to look at it again when the MA strat road/rail system is reinstated but some more realistic snowy terrain in the summer ETO texture pack might give me the incentive to work on it again. I'm not keen on making this an-all winter MA terrain though.