Paladins rely heavily on reactions for their 'smite' ability
The use of the words "Holy Knight" is a pretty obvious clue - since the Paladin is a Holy Knight.
Haha - yeah. I edited my post. The giant "HOLY KNIGHT" in the middle of the screen somehow eluded me.

So you are assuming the reaction overhaul will be included just because Paladins rely so heavily on them? That seems like a reasonable guess - was just wondering if there was anything else I missed!