Get into the pilot asap for the "****New Salesforce Mobile App***" that brings the Lightning Experience to your mobile device in a whole new way! Just open a case with Salesforce Support (and share your sandbox ID) to get it now. Will be GA in Spring. 

1. Customize the New Salesforce Mobile App with Lightning App Builder: https://www.youtube.com/watch?v=6EqLsQVkEJQ

2. The new Salesforce mobile app: https://www.youtube.com/watch?v=qBfai6IagAc