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Polarized thermal emission from interstellar dust grains can be used to mapmagnetic fields in star forming molecular clouds and the diffuse interstellarmedium (ISM). The Balloon-borne Large Aperture Submillimeter Telescope forPolarimetry (BLASTPol) flew from Antarctica in 2010 and 2012 and produceddegree-scale polarization maps of several nearby molecular clouds witharcminute resolution. The success of BLASTPol has motivated a next-generationinstrument, BLAST-TNG, which will use more than 3000 linear polarizationsensitive microwave kinetic inductance detectors (MKIDs) combined with a 2.5mdiameter carbon fiber primary mirror to make diffraction-limited observationsat 250, 350, and 500 $\mu$m. With 16 times the mapping speed of BLASTPol,sub-arcminute resolution, and a longer flight time, BLAST-TNG will be able toexamine nearby molecular clouds and the diffuse galactic dust polarizationspectrum in unprecedented detail. The 250 $\mu$m detector array has beenintegrated into the new cryogenic receiver, and is undergoing testing toestablish the optical and polarization characteristics of the instrument.BLAST-TNG will demonstrate the effectiveness of kilo-pixel MKID arrays forapplications in submillimeter astronomy. BLAST-TNG is scheduled to fly fromAntarctica in December 2017 for 28 days and will be the first balloon-bornetelescope to offer a quarter of the flight for "shared risk" observing by thecommunity.

Instrumental performance and results from testing of the BLAST-TNG receiver, submillimeter optics, and MKID arrays