For your information, Nova launcher is easy to use, lightweight and fully customizable home screen replacement app that features a range of color themes as well as a wide choice of icons and a scrollable dock to bring a bespoke look to your Android phone. How to enable Android L features on Nova Launcher:

Install or update the launcher (Nova settings ->update) to the latest version (currently 3.0.2) and follow the guide given below.

  1. Android L style folder preview: Go to Nova settings -> Folders -> Folder Preview -> Line
  2. App animation: Go to Settings -> Look and Feel -> App Animation -> Slide Up
  3. Search bar: Go to Settings -> Desktop -> Persistent Search Bar -> L, (or long-press on the quick search bar widget and select Edit)
  4. App drawer icon: Long-press on the app drawer icon and select Edit then tap the icon and select the opaque white icon under Built-in. Leave your views in the comment section below