Yes apparently it is the Euro 5 model with minor cosmetic changes. Thanks to the Euro5 standard it is also going to be heavier (+6kg).
"The most powerful version in the current range, the RS (pictured above) makes 121.2bhp (90.4kW) at 11,750rpm. Next year’s Street Triple RS is type-approved at a near-identical 121.4bhp (90.5kW) at the same revs, which is impressive given the cleaner exhaust emissions. The bike’s dimensions are virtually unchanged but weight increases by 6kg from 181kg to 187kg in ready-to-ride form including a full tank of fuel.
Triumph Street Triple getting updates for 2020 - Bennetts.co.uk "