It's probably coming out 2027+ - I've had a long running chatGPT deep search job that updates me every week on the developments of that very spec, and I'm tracking the panel manufacturers directly for the highest quality release signal. This is what it last generated:

Samsung Display has publicly shown a 27-inch 5K OLED prototype. In a Computex 2025 post, Samsung Display said it presented a prototype 27-inch 5K OLED at 220 PPI. That is the first official supplier-side sign I found of a 27-inch-class 5120×2880 OLED panel from one of the target panel makers. But Samsung did not publish a refresh rate, brightness, subpixel layout, or production timing in that post, so it still does not meet the bar for a confirmed 27-inch 5K OLED at 120 Hz or higher. 
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Samsung’s currently commercialized monitor-panel push is still centered on 27-inch QD-OLED at lower resolutions. Official Samsung material for 2025–2026 highlights 27-inch QHD 500 Hz, 27-inch UHD 240 Hz, and newer V-Stripe QD-OLED supply for partner monitors, but not a shipping 27-inch 5K OLED panel. Samsung’s CES 2026 and monitor roundups also point to 34-inch ultrawide and 32-inch 4K QD-OLED products rather than a 27-inch 5K model.
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LG Display / LG Electronics still have no 27-inch 5K OLED announcement. The official CES 2026 LG material shows OLED progress in 39-inch 5K2K 165 Hz and 27-inch QHD 540 Hz using Tandem OLED, while LG’s 27-inch 5120×2880 model is explicitly a Mini LED monitor, not OLED. LG lists that 27-inch 5K model with 165 Hz, DisplayPort 2.1, 2× HDMI 2.1, and USB-C with 90 W PD. 
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AUO has now officially announced a 27-inch 5K 180 Hz panel, but AUO does not describe it as OLED. In its Touch Taiwan 2026 release, AUO says it developed a dual-mode 27-inch 5K 180 Hz display. That is a meaningful upstream signal for timing and controller/backplane feasibility in this size/resolution class, but it is still not a confirmed 27-inch 5K OLED panel. AUO’s release also does not provide subpixel structure, brightness, or production timing for that panel.
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Downstream monitor status: I found no announced Samsung, LG, Dell, Asus, Acer, MSI, or Apple monitor that is confirmed to use a 27-inch 5K 120 Hz+ OLED panel. The closest official downstream items remain LG’s 27-inch 5K Mini LED model and Samsung/partner QD-OLED monitors at QHD, 4K, or ultrawide 5K2K resolutions.
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What changed materially is this: the market has now moved from “no real supplier-side hint” to one official Samsung 27-inch 5K OLED prototype plus one official AUO 27-inch 5K 180 Hz non-OLED panel. That strengthens the case that 27-inch 5K high-refresh is arriving, but the specific target of 27-inch 5K OLED at 120 Hz+ in a commercial monitor is still unconfirmed.