A huge overhaul of the Formula 1 technical regulations is coming in 2026 but George Russell believes Mercedes cannot get too carried away amid their growing optimism. F1 is set to introduce potentially its biggest shake-up ever with new chassis and engine rules on the horizon. Not since the pinnacle of motorsport introduced the V6 turbo-hybrid power unit for 2014 has it changed the engine rules as much, let alone alongside new chassis rules. Mercedes completely aced the introduction of the V6 turbo-hybrids with Lewis Hamilton (6) and Nico Rosberg winning every drivers’ title between 2014 and 2…