Only shown as a big question mark on the Bell & Ross homepage with a countdown for its Basel World unveiling. The new BR01 Grand Complication features a Tourbillon and what appears to be a 'Thrust' indicator? I can maybe assume this watch measures G-Forces (previously featured G-Force watch --> Link). Makes sense, the BR01 Instrument series are designed to look like aeronautical gauges anyway...
via Professional Watches
UPDATE: Thanks to Alex of QP Magazine for not only seeing the gauge says (oddly) 'Trust' rather than Thrust and both him and Stepan Sarpaneva for pointing out the likelihood of it being a Dynamographe-style Mainspring Torque Indicator as the Audemars Piguet Royal Oak Concept Tourbillon shown below;
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