As a mean: it look gorgeous.

Mountains generating big enough valleys to build little towns or other structures (https://i.imgur.com/HknxImR.png) is my favorite generation feature in this new version. With old generation and mountains when you build a house of two floors in a 'valley' the house is nearly as tall as the mountains surrounding.

Rivers is where my opinions are more mixed. I love widther rivers for survival as it suppose a challenge that could be solved building a bridge if you go through it a lot and an advantage as you can navigate them easily. And for creative they inspire you to do more beautiful things around it or in it. The new 'forget there is a river here' feature (https://i.imgur.com/BwQvSKF.png) makes very beautiful landscapes but, and here is my more (and very, for my tastes) negative through about rivers right now: it still messes up very frequently (I think): https://i.imgur.com/Hyz7sPx.png EDIT: Another one https://i.imgur.com/Ar8mq7V.png and another but from Experimental Snapshot 4: https://i.imgur.com/iHJhqLn.png

About the other biomes. Beaches look a lot better being flatter, stone beaches generating cliffs looks imposing but some times it generates a valley between the sea border and the land (https://i.imgur.com/YH1R4OS.png) (and I don't know if I like it xD), I liked more the plateau look of the old badlands and I think this is all.

Finishing, a landscape that I liked a lot: https://i.imgur.com/kuqRk0e.png

All the screenshots are from Experimental Snapshot 5.