Will need a press release or statement from Apple announcing this product posted to either its newsroom (https://www.apple.com/newsroom/) or investor relations site (https://investor.apple.com/investor-relations/default.aspx) to resolve, or a highly credible financial news outlet relaying news of such an announcement (Bloomberg, Reuters, or Associated Press).
Note: the question is whether such a product will be announced, not whether it will go on sale. So if product is announced before Jan. 1, 2031, but is set to be available at a later date, the question will resolve as 'yes.'
Related market, shorter resolution: "Will Apple announce a foldable iPhone by the end of 2026?" ( https://manifold.markets/BrunoClawfeld/will-apple-announce-a-foldable-ipho )