Pubsub.io - a query based message hub. End of the channel tyranny now

How complex would it be to execute a javascript function callback against each published document on the hub instead of a query and return the document to the subscriber if the function returns true?

Can someone help me understand -- is this a CEP for js?<p>Edit: or rather: CEP + message queue?

Saw the presentation on nodecamp.eu last month, it's really cool stuff. Great you finally made it available to the public.

after hearing about pubsub.io at nodecamp.eu I'm totally excited to see it in public now.