I have noticed this as well and have been looking around to see if anyone has brought this to my attention.
I was thinking of getting LeBlanc as I saw her abilities in the Client and I saw the Preseason changes for her and I found her really interesting.
However, I was unaware she had changed until she went on Free Rotation recently and played a game as her.
This is an important issue as for new players, Blue Essence is pretty precious and I almost wasted mine on a Champion that was shown to me completely inaccurately.
Not to mention that the changes make her seem really uninteresting (In my opinion) as I really liked her Ultimate that makes a clone from her.