Google's Material Design: The Hub For All Android L Apps
I've been noticing that google has already updated many of their apps, as well as many others already working on updates. So I think this thread is a hub strictly for notifying people of apps that have been updated or shown in android L design, to be updated soon. I'll start for the ones I know have been updated. Feel free to add others.
Coming by the full release in fall. (Notice the notification effect).
Google Play Music
Google Play Store Update (Leaked by Android Police)