Not only will Sora receive an amiibo, I am willing to bet he will receive multiple, due to Nintendo/Disney going all out with his alts, and him being the final fighter like

Zoro's birth. : r/OPBR

Guest Fighter - TV Tropes

Sora Smash Bros. Amiibo Orders Be Like

Nomura discusses Kingdom Hearts 4, Missing-Link, and Dark Road in extended Famitsu interview - News - Kingdom Hearts Insider

Sora Named Most Wanted Smash Bros. Ultimate DLC Fighter In Recent Japanese Poll

Controversial Rising Sun Design Removed From Street Fighter II's Re-Release

MOCKUP] What If… We Get a Nintendo Produced Sora amiibo? (Do you think Disney will produce it instead if it does release?) : r/amiibo

I would sell my soul for the Sora amiibo to at least be announced. : r/KingdomHearts

The (Sadly Fictional) Super Smash Bros. for Nintendo Switch Fighter Ballot - Results! - Feature