@Meddler, reasons behind the Leona changes?

I have been a long time player of Leona, she's been my main since S1, and this is the first real drastic change she's ever received. I would like to hear your thoughts on why you guys decided this change and what it was geared towards in terms of her power and gameplay? In my personal opinion, Leona has been one of the most balanced champions Riot has ever created (She's hovered around 50-51% win rate for a while now), and I didn't expect her changes to be much, so I'm rather curious about what you guys are going for.
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