This is a bugfix release and a recommended upgrade for all users.
As always, please let us know if you have any problems by opening an issue at https://jira.mongodb.org/browse/JAVARX or posting any issues / questions to the MongoDB user group http://groups.google.com/group/mongodb-users
The JVM Driver team
[1] http://mongodb.github.io/mongo-java-driver-rx/1.3/changelog