BLAST-TNG is a new telescope designed to observe the polarized thermal emission from interstellar dust. The data it collects will provide new insight into the properties of dust and the role of magnetic fields in the interstellar medium through a wide range of densities. BLAST-TNG will produce several-degree-scale polarimetric maps at sub-arcminute resolution, making simultaneous measurements in its 3 broad bands centered at 250, 350, and 500 μm. The new instrument is scheduled to launch aboard a stratospheric balloon from Antarctica in December 2017 for a 28 day flight. Of this time, 25% will be made available to the community for shared risk proposals.