Add a visual indicator of turn order and magnitude
I would say one of the most common threads on these forums involves a lack of understanding of turn order and ticks. And I don't blame the people creating them - I've been playing this game for about a year, and I still regularly shrug my shoulders at how it works.
As an example, an arena matchup I had where the other team's Arbiter won the speed race, followed by his Helmut and Serris. After Serris, my Arbiter stepped in, and then his Astralon acted instead of my Kymar, who is fast enough to go immediately after Arbiter.
I "understand" how this happens, broadly speaking - Astralon's turn meter was boosted above 100% because of the tick after my Arbiter's action, while my Kymar was still behind him despite being boosted.
But the murkiness of this makes it very difficult to predict. And there's no reason for this at all.
I suggest two things:
1) Show the next X champions to act, in the order they will act in. I don't know what X should be, I'm not a UI designer, but it should be at least 4.
2) Space them out in a way that indicates the magnitude of the difference. When combat started in my above example, the order would perhaps "naturally" be his Arbiter -> my Arbiter -> his Helmut -> my Kymar. After his Arbiter's turn, the new order would be his Helmut -> my Arbiter -> my Kymar -> his Serris, etc... But each of those would be spaced apart in a manner indicating just how much they are differing by. Even better would be to put numeric values to make this explicitly clear.