I think this change only applies to AP partners and clients who publish AP stories for
commercial use. For instance, the NYT which is available both in print and online, was paying AP only for publishing their stories in the print medium. Now they are required to also pay for publishing AP stories online.
Nothing changes for us when we are linking to AP stories or discussing them or even quoting parts of them. How it will affect Google News and the like, I don't know
I am sure Google shareholders shouldn't be too happy about this development.