For those of who are tech savvy and a little bit anxious can get the Galaxy S5 apps right now. Several apps from the Galaxy S5 were extracted and made available for download on the XDA-Developers forum.
The applications received a facelift on the Galaxy S5, sporting a flatter, more modern look, as well as enhanced functionality. XDA member Albe95 uploaded .apk files for the following apps: S Note, Watch ON, S5 Calculator, Gear Fit Manager, Galaxy Gear Manager, S Health, and S Translator (Click on each of the names to Directly download them or Check out this thread to download them)
Those interested in testing out these apps should keep in mind that root access is required for installation; apps can be installed as normal APK files. Tech website SamMobile also notes that installation may also require devices to run Android 4.4.2 KitKat.
There are some limitations to the extracted app files. The Gear Fit Manager will not be functional as the Gear Fit companion device has not yet released to the public. The S-Health app is reportedly also not working. Installing the new versions of the already installed apps may also cause some issues. You can try to uninstall the current app before installing this to avoid some of the issues. If you are up for a challenge, give it a try and let us know whether you like it.
Source – XDA-Developers