This is the second release candidate of the upcoming 1.6 (stable) branch. This new branch contains several new enhancements and bug fixes. For example, support for files greater than 2 GB, it can export SSL session keys, it can export SMB objects, graphs now save as PNG images by default to name a few. It also supports a large number of new protocols. This update can be downloaded here.
 

[1] http://www.wireshark.org/lists/wireshark-announce/201106/msg00000.html

-----------

Guy Bruneau IPSS Inc. gbruneau at isc dot sans dot edu