There is nothing built-in but it would be straightforward to update your model data over web sockets. The magic of Ember bindings and observers will take care of the rest.
While, true, Ember will happily update any model pushed to it the difficult bit i.e. pushing the right data to the right model (on the right client) and only the right model to only the right client is an exercise left to the reader.
The cleverness of Meteor is not in the push, it's in the logic just before the push.