The releases published are inconsistent among each other.

Official jar download
There is a single jar named mongo-driver-java-2.11.2.jar available as download at http://driver-downloads.mongodb.org/java/2.11.2/mongo-java-driver-2.11.2.jar. This is a single jar that contains org.bson.* as well com.mongodb.* packages.

Building from source (github) using ant
This builds two jars - one for com.mongo.* packages and one for org.bson.* packages.

This difference means that anyone building from source gets a different jar than someone getting a pre-built jar from maven.