At the moment HRD version 4.1 SP5 is the latest official release, this includes updates to support changes in QRZ.com and the DX Cluster.
At the request of many users HRD 4.2 will be created which includes all changes made for QRZ.com and the DX Cluster, in additional support for new radios such as the IC-7200 will be included.
The aim is to get HRD 4.2 released by the end of 2009 and then keep 4.2 on maintenace until 2011 or longer if there is enough demand.
More information will be posted here as soon as I start on the 4.2 kits.