Rumored — not yet announced. Apple has not confirmed Apple Watch Ultra 4 or any specification on this page. Everything below is drawn from leaker and analyst reporting, cited to its original source in our news coverage. Last updated 2026-08-26; this page will be rebuilt with confirmed specs once Apple officially announces the device.
Apple Watch Ultra 4
Expected to announce September 2026 (expected — unconfirmed as of publication) · Expected release September 2026 (expected — unconfirmed as of publication)
What's rumored so far
Also in Bloomberg's reported "late-stage testing" batch alongside the Series 12. The Ultra line hasn't had a genuine hardware refresh in a while — Ultra 3 shared its chip with the standard Series 11 rather than getting anything Ultra-specific. This year's changes are reported as concentrated under the hood (new chip, longer battery target) rather than a visible redesign, despite less-authoritative rumors of a thinner case. None of this is confirmed; Apple has not announced this device.
Same strong "late-stage testing" sourcing as the Series 12 for the device's existence and timing. The specific 15%-thinner-case and 72-hour-battery figures come from a single buying-guide source (ESR) rather than Gurman's own reporting, so we've flagged them as the weaker end of this page's sourcing rather than presenting them at the same confidence level as the testing-stage report.
Chip
New chip, name unconfirmed (rumored)Battery
Up to ~72hr claimed (one source)Design
No visible redesign expectedThickness
~15% thinner (single-sourced)Predicted price — not official
£799 (predicted, unchanged from Ultra 3)$799 (predicted, unchanged from Ultra 3)€899 (predicted, unchanged from Ultra 3)
Rumored specifications
Every row below is unconfirmed. Where sources disagree, we've noted the disagreement in the note rather than presenting one figure as settled.
Status
Testing stage
"Late-stage testing" per Bloomberg's Mark GurmanSame report batch as the Series 12
Performance
Chipset
New chip, successor to S10 (rumored)The Ultra 3 shared its S10 chip with the standard Series 11 rather than getting Ultra-specific silicon — this would be a genuine change to that pattern
Battery
Claimed target
Up to ~72 hours by one buying-guide source (ESR)Real-world use is more likely to land in the 48-60hr range even if the headline number holds up — single-sourced, treat with caution
Design
Overall
No visible redesign expectedGurman's reporting is clear that changes are concentrated under the hood rather than in the case design
Thickness
~15% thinner claimed (single-sourced, ESR)Not corroborated by Gurman's own reporting — weaker sourcing than the chip/testing-stage claims on this page
Where these rumors come from
This page summarizes our own reporting below — each article goes into the full sourcing, outlet-by-outlet, for that specific rumor.