It looks like a new variant of the Galaxy S4 mini, that not-so-related sibling of the Galaxy S4, is on its way. A device with model number SGH-I257M recently received Wi-Fi certification, and the model number pits it as being a Canadian carrier variant (probably for Bell, they have a habit of adding an M at the end of the model name) of the device, though no official details are currently available.
The Galaxy S4 mini sports a 1.4GHz Snapdragon 400 processor with Adreno 305 GPU, 1.5GB of RAM, a 4.3″ qHD (540 x 960 pixels) display, 8-megapixel rear camera, 1.9-megapixel front-facing camera, 8GB storage expandable via microSD cards, a 1,900mAh battery, and Android 4.2.2 Jelly Bean with TouchWiz Nature UX 2.0.