It is what it's sells

New clean layout for optimal readability
Great modern typography
Convenient fixed table-of-contents
Quick preview when hovering over links
Multi-language search with thumbnails
Beautiful, immersive cover photos
Larger photos and better media gallery
Easy article narration and audio playback
Color, font and layout personalization
Dozens of other improvements

I adore it, makes Wikipedia even more engaging and pleasant to read.

A very elegant reading experience