These didn't make it into the alpha 3 debs unfortunately.  They're mostly
bugfix releases, but they also include a new member in the
visualization_msgs/Marker message to fix an oversight in the MESH_RESOURCE
marker, and support for it in rviz.

For more details see the changelists:
visualization_common:
http://www.ros.org/wiki/visualization_common/ChangeList
visualization: http://www.ros.org/wiki/visualization/ChangeList/1.1

Josh