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For future reference, this moved to the ros-sig-ng-ros list, specifically here: content-based topic subscriptions?.

Following was the answer by Dirk Thomas:

content-based subscriptions are a really interesting feature.

The current ROS 2 prototype only uses it internally to implement request/reply on top of publish/subscribe in OpenSplice (ref).

The current RMW interface does not offer an API for specifying a filter criteria though. But since the feature would be pretty useful it might be added in the future to allow custom filters as well.

We would need to ensure that it is possible to specify the filter criteria in a vendor agnostic way.