Data Pipeline 4.1 includes MongoDB integration, improved joins for streaming data, a new email reader for IMAP and POP3, JMX Monitoring, an in-memory Event Bus, updates to the dynamic expression language, and more. 

There are also a ton of new Java code examples for all the new 4.1 and 4.0 features. 

Enjoy.

Data Pipeline 4.1 - New and Noteworthy