They're still Minecraft-y but just better? I like the tree leaves: From what I've seen, they're decent on the whole.
Mojangeers have made new versions of most-but not all-textures, fancying up a lot of the game. This is all unrelated to-and quite different from-the 4K HDR fanciness and Super Duper Graphics Pack coming to Minecraft's separate Windows 10 edition, which between them are adding all sorts of incongruous lighting effects. If you fancy seeing for yourself, hey, you can download and test this today. Touching up everything from blocks to items and enemies, the new textures look like Minecraft but a little nicer. A minor makeover is coming up the good ol' original Java version of Minecraft, keeping those same blocky looks but remaking textures.