I think we are gonna see a lot of Skull Shields and Mirror Shields from everyone, as well as probably 2 copies of Bone Wall/Pandemonium from entropy. I don't think we can afford to take as many Firebolt based decks as we took last war. Mirror Shields were hard to salvage and implement, so teams that didn't pack them just didn't have them. But now, with Sanctuary and Crusader, suddenly light duos are easy with every element. We will definitely see more Mirror Shields.
How?
Well, we need decks that focus on higher HP creatures, because frankly, we are just gonna get eaten alive by any deck that packs Skull Shield. Alternatively, heavy PC could be included any deck with a lot of low HP creatures. Also, permanent-heavy decks would be a nice change from the last war. Some of the more premiere decks can be recycled almost card-for-card, but we need to throw some new stuff in, too.