Surprising that people aren't talking about this feature more. It's really nifty. The IE games didn't offer this. You could turn on To-hit rolls in the settings, but that's all you'd get. This system offers far more information, along with the added bonus that it's hidden by default, and visible if you mouse over the specific line in the combat log. That's brilliant.
They really need to make it a toggle or make it so you need to hold a button for it to appear though, scrolling through the combat log with every line changing when you mouse over it is really annoying.