Sadly it was been recently announced that Photoshop Touch will no longer be developed and supported. This means no new updates.
The other major part of this, is that it will also no longer available in the iOS or Android app stores. So if you have problem and need to reinstall you won’t be able to.
This is real sad news. For more details see the Adobe Website:
Rex Co Media is a loyal follower of Photoshop Touch, and believe it is an amazing app. Even though it is no longer being developed, Rex Co Media will continue to have tutorials for Photoshop Touch.