FamilySearch has released two new apps for iOS and Android devices. They are available in the app store from the devices such as iPhones, iPads and Android devices. I wrote a brief overview of the apps on Genealogy's Star. The apps are called FamilySearch - Tree and FamilySearch - Memories. There is another app available also called Turn Hearts.
Here is a screenshot from my iPad of the Tree app:
This seems to be the only view supported so far, but this is a brand new app and will likely change in the near future. The app appears to be only a viewer because I could not edit any of the entries.
The Memories program is also a viewer, but you can add photos directly to the online FamilySearch Family Tree from your device's camera or from the images stored on your device. Here is a screenshot, again, from my iPad:
Here is a screen shot of the Turn Hearts app also:
I am sure I will have more about these apps later.