I would be extremely interested in having UC surface available on smartphones (Android in my case).
Behringr Xair series have their mixer app available for both smartphones and tablets and it works great even with the smaller screen ratios (their interface is similar to UC surface)
This would be particularly helpful for :
- quick one-hand use for setting most important parameters
- avoid bringing a tablet or laptop with me on a venue
- as a backup in case of trouble with the tablet (forgotten/stolen/broken). Currently I feels very unsafe to depend on a single tablet device and knowing there is no possibility to backup with a mainstream smartphone in case of trouble.