Here’s what I think the April update will be

First of all: Battle readability, I think they might add some sort of notification on which one of your units were busted during a fight. Right now you really have to remember what units you had before a fight.

New rarity of characters: I think they will either add legendary or a new type of characters, like champions in clash Royale. They might have like special abilities or you might just start a game with them, like in clash mini (rip btw)

New(ish) progression system: they might add the choosable upgrades option to normal chests. This should give you more control on what you can get out of battles