Short answer: Yes — the most recent flagship smartwatches from the major makers are introducing some genuinely new health-tracking sensors and AI-driven measurements beyond basic heart rate, SpO2 and sleep.

Highlights (by brand) — most important new/unique features and when they appeared:

• Apple Watch (watchOS 26 / 2025 updates)

  • Hypertension (high‑blood‑pressure) notifications using the optical heart sensor over multi‑week analysis. Available across recent models via watchOS 26. (theverge.com)
  • New Sleep Score that combines heart rate, wrist temperature, SpO2 and respiratory data. (theverge.com)
  • Blood‑oxygen tracking was re‑enabled in the U.S. with a change: SpO2 measurements on some models now require the paired iPhone to process/display the data (rollout noted Aug 14, 2025). (techradar.com)

• Samsung Galaxy Watch (One UI/One UI Watch updates, 2024–2025)

  • Antioxidant Index — a claimed skin carotenoid measurement (carotenoids correlate with antioxidant intake) measured in seconds via a light‑activated BioActive sensor. Presented as a nutrition/healthy‑aging metric. (news.Samsung.com)
  • Vascular Load — a sleep‑based vascular stress metric, plus new sleep guidance and AI‑driven Energy/Wellness insights (Galaxy AI integration). These arrive via One UI 8/One UI Watch updates and Galaxy AI features. (news.Samsung.com)

• Google / Pixel Watch lineage

  • Recent Pixel Watch updates added extra on‑device sensors and features like Body Response, improved heart‑rate zone coaching, and safety features (Emergency / Medical ID / Safety Check) — focused on more accurate heart/body metrics and safety. (Pixel Watch 2 was the notable upgrade in this line earlier.) (lifewire.com)

• Garmin and sport‑focused brands

  • Garmin continues to push advanced physiological metrics for athletes (FTP/power estimates, lactate‑threshold/threshold‑style metrics, advanced recovery and training load). These are incremental but deep rather than a single novel consumer health sensor. (See Garmin product pages/announcements for model‑specifics.) [general note; see vendor pages.]

Caveats and context

• Many of the newest metrics (Antioxidant Index, Vascular Load, Hypertension alerts, AI Energy/Wellness scores) are intended for wellness and fitness insights, not medical diagnosis. Availability can vary by region, phone pairing (iOS vs Android), watch model, and software version. Manufacturers often roll features out in OS updates, so some features appear on older hardware after a software upgrade. (theverge.com)
• Because “the latest smartwatch” could mean different models (Apple Watch Series 11 / Ultra 4, Galaxy Watch X, Pixel Watch 3, new Garmin), I summarized the most notable, widely reported health innovations across the major ecosystems as of mid–late 2025. If you tell me which specific model or brand you mean, I can pull the exact, current feature list and availability for that watch.