The Android 5.0 Lollipop update for the YU Yureka was sent for certification a couple of days ago and today it received the stamp of approval. The update will roll out in phases over the next three days, so you may have to wait until the weekend to get it.
The latest software is based on Cyanogen OS 12 and brings additional theming support, improves mail with CyanogenMail and Exchange support, plus multiple account integration.
Android 5.0.2 running on the YU Yureka
The update was originally scheduled for the first week of April, but better late than never. You can join the others waiting for the OTA roll-out to reach their Yureka over at the YU forums (follow the source link).
Thanks to Pankaj for tipping us off!