If by any case you have not received e-mail with Latency update from Kano Apps and Free Item with Refill of your choice included, or you have not read all about in game news (forum), on the first image there is e-mail I received tonight and on the bottom of this post it will be link for Reward from Kano placed.
All about Game Performance you can find on forum or by clicking on this link:
(email I've got from Kano)
REWARDS FROM KANO
Pick your reward in the game or you can pick it by clicking on the following link
(be careful you can pick one only)