Just noticed Nitecore released lens heater, a camera cleaning pen and electronic blower. Electronic blower and lens heater certainly looks interesting, also attached is a review of blower.
Camera Cleaning Pen
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BlowerBaby™ (Discontinued)
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LHH82
With a full wrap-around design, The NITECORE LHH82 lens heater can provide 45℃ (113℉) thermal control to prevent camera lens fogging up. Compatible with a filter size of 72~82mm, the LHH82 can be used even at a low temperature of -40℃.
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