Poisson Timer

Add a Poisson based timer

GUI and OS interaction

Support for file Drag and Drop.

Confirm Remove Dialog box

Add a dialog box to confirm removing the element(s) when Remove action is called

The dialogue can be skipped by setting the JMeter property confirm.delete.skip=true
Remote batching support

Use external store to hold samples during distributed testing， Added DiskStore remote sample sender: like Hold， but saves samples to disk until end of test

JMS Subscriber sampler

With JMS Subscriber， ability to use Selectors

New Logger Panel

A new Log Viewer has been added to the GUI and can be enabled from menu Options > Log Viewer:

This Log Viewer shows the jmeter.log file， and useful (for example) to debug BeanShell/BSF scripts:

The menu item Options / Choose Language is now fully functional

The menu item Options / Choose Language now changes all the displayed text to the new language provided all messages are translated. You can help on this by translating into your language.
Legacy JMX and JTL Avalon format support restored

Support for reading/writing the original Avalon XML format of JMX (script) and JTL (sample result) files was dropped in JMeter version 2.4. JMeter can now read the Avalon format files again， however there is no support for saving files in the old format.
JMeter jars available from Maven repository

JMeter jars are now available from Maven repository.

完整的内容请看：http://jmeter.apache.org/changes.html