Silhouettes for Banshee's Veil and Luden's Echo are very hard to read compared to their old icons. I stared at the BVeil icon for a full 10 seconds trying to figure out what the positive and negative spaces were. It's too busy. Similarly, the icon for Zhonya's Hourglass looks cool when examined closely, but the silhouette doesn't read at all in miniature.
Luden's and Needlessly Large Rod also lose too much of their color familiarity. The important parts of both those icons for quick identification were always the bright purple backsplash and glow, respectively. Also, Luden's changed direction.
All of the other icon updates we saw look real good though.