Google I/O 2026 is May 19-20 at Shoreline Amphitheatre. Multiple pre-event reports from major outlets (Tom's Guide, Android Central) indicate Google is previewing Gemini 4 as the headliner. Other expected announcements: Ironwood TPUs (42.5 exaflops), AI glasses, Android 17, Aluminium OS. RESOLVES YES if, during the May 19-20 I/O 2026 keynote or developer sessions, Google publicly announces a model marketed as 'Gemini 4' (any variant: Pro, Flash, Ultra, etc.). The announcement must be official from Google (keynote stage or official blog), not leaked. Whether the model is immediately available, in preview, or scheduled for later release does NOT matter — the announcement itself triggers YES. RESOLVES NO if no model named 'Gemini 4' is announced during the I/O 2026 conference window. A Gemini 3.5 announcement does NOT count — must specifically be Gemini 4.