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This paper investigated MIMO SAR for several specific remote sensing applications from a top-level system description, with an aim to call for more publications and research on these topics. Due to the significantly increased degrees of freedom, MIMO SAR provides better system design flexibility and improved system performance. The potentials and challenges of MIMO SAR in HRWS remote sensing, GMTI, and 3D imaging are analyzed. It is shown that MIMO SAR indeed provides promising potentials for future remote sensing but much further research work about waveform diversity design and signal processing algorithm should be carried out.