Verified facts
What happened
Verified from the Shopify Developer Changelog: Hydrogen now supports links that identify a variant and open that variant instead of the product default.
The preview adds a cart refresh capability for cases where custom code changes the cart, including a cart created on a server.
Hydrogen now creates local HTTPS certificates for Customer Account testing, reducing local login setup to one command or none, according to the changelog summary.
Business relevance
Why it matters
Variant-specific links could make traffic from sources such as a Google Shopping feed land on the intended product option rather than the default, if the storefront correctly adopts the preview capability.
A cart refresh workflow may help custom storefronts reconcile what shoppers see after server-side or other application-driven cart changes, but the supplied evidence does not establish how broadly it works.
Simpler local HTTPS setup could shorten the path to testing customer login flows, especially for teams that currently spend time configuring local certificates.