Meta's recent Muse Spark release cadence supports the market's overwhelming 93.5% implied probability of no 1.4+ version by October 31. After Muse Spark 1.3 launched on September 2, Meta shifted focus toward the newer Muse Wonder models in early October, with no official announcements, API updates, or credible reporting indicating imminent Spark iteration. The prior rapid cycle of 27–28 days between 1.2 and 1.3 appears to have lengthened amid broader model family development. Traders price only slim odds for mid-to-late October dates, reflecting the absence of developer previews or benchmark leaks. A surprise release could still occur if internal safety testing completes early or competitive pressure accelerates timelines, though current evidence points to December or later.