Joe Rossignol, MacRumors:

Apple today indicated that “back-glass only” damage on iPhone 12 and iPhone 13 models is now eligible for repair under AppleCare+ for a reduced fee of $29 in the United States, $39 in Canada, £25 in the UK, or the equivalent in other countries.

And:

The iPhone must be covered by AppleCare+ and have no additional damage beyond the damaged back glass that would prevent Apple from replacing the back glass, such as a bent or dented enclosure.

Back glass, as opposed to the front display.