Can we finally share information with other teams? I thought having alliances was a big thing in Wars??
I don't see what free information sharing would achieve? Most of the info that teams have in war is already public, in the form of all the decks being used each round. Sure teams could trade information about what they discarded/salvaged or what cards they have left in vault, but that is always going to be a zero-sum game and thus inherently bad for some party. Also all the lies going around probably makes most of the info useless anyways.
I have thought about mechanics which would allow alliances to come into war, such as non-aggression pacts or trade deals. But they are usually too imbalanced to work in practice, or too complicated to patch up all the imbalances. If they were the key mechanic the complexity wouldn't be an issue, but the rules would be layered on top of the already complex vault system, where vault management and testing already take up significant time for top teams. At some point the complexity becomes meaningless and people will simply choose the easy option without much thought.
We could also try mechanics which aren't exactly alliances, but are inspired from diplomacy. e.g. you might be able to give a team 5 cards from their element, in exchange for starting the next match vs them with one free game win. But these have to be drastic and high-risk, high-reward to have a real effect. Perhaps one might be used as an EC, but I don't see them becoming part of War in general.
And a big issue with allowing alliances is that it will further exacerbate the problem of middle teams playing to not lose and obtain the best rank possible and making bottom teams suffer. What I foresee is a top team and a middle team allying to target other middle teams and bottom teams, while the top teams stay relatively untouched. No one is going to agree to an equal partnership with a bottom team that's soon to be eliminated, and unequal partnerships are simply going to tip the scales even farther for the teams on top.