The Deep Underground Neutrino Experiment (DUNE) is a next-generation experiment that aims to make high-precision measurements of neutrino mixing parameters and search for Beyond Standard Model (BSM) signatures. DUNE Phase II will include an upgrade to a high-pressure gaseous argon TPC, known as ND-GAr or the More Capable Near Detector (MCND) in DUNE's near detector complex. With its fine-grained tracking capability and low detection threshold, ND-GAr will play a key role in reducing systematic uncertainties related to nuclear effects in argon, which are critical for neutrino oscillation measurements, and will also enhance searches for BSM physics. This paper will highlight the ND-GAr design, its performance expectations, and the ongoing R&D efforts for various readout systems, including wire chambers and Gas Electron Multipliers (GEMs).