For some time now, rumors have been going around that Samsung will release different versions of the Galaxy S 4, including the S4 Mini and a rugged version, reportedly called the S4 Active (previously the Activ). A recent update to the Samsung WatchON app further supports the rumors.
The recent 5.4 update to Samsung WatchON includes the following text in the changelog: “Added support for upcoming S4 Mega, S4 mini and S4 Active.” We hadn’t heard about the Galaxy S4 Mega yet, but it doesn’t take a genius to suggest that it will be what its name suggests — a bigger version of the S4. Another possibility is that Samsung made a typo and they instead meant the Galaxy Mega, which is in fact supposed to come with WatchOn.
Considering this is an app developed and released by Samsung, I think this provides enough evidence to think that these phones will be arriving in the near future. Just when? Here are the release dates that were leaked earlier this month.
Source: Android Central