Samsung isn't going to stop flooding the market with multiple devices in each price segment any more than Apple is going to start licensing iOS to other manufacturers, and now four new and unknown Samsung phones have shown up in a shipping manifest, carrying the model numbers SM-G730A, SM-G3815, SM-G9105, and SM-G7102, with 4″, 4.5″, 5″, 5.2″ screens respectively.
There's no other info on the SM-G9105 and SM-G7102, but UAProf strings on Samsung's mobile website reveal the display resolutions for the other two. The SM-G730A's 4″ screen will have the customary WVGA (800 x 480) screen like all other 4-inch Samsung phones, while the SM-G3815 sports a qHD (540 x 960) resolution, which means it will have a pixel density lower than the Galaxy S4 mini and S4 Zoom, something that will probably put off a few people before the devices even go official.
What will these new devices be? Sadly, with Samsung changing the way they use model numbers, we'll have to wait till their official announcement to find out. But hey, feel free to speculate and discuss in the comments.