Support for Red Hat Enterprise 6 will be available with VirusScan for Linux 1.7 due in Q2 2011. It will include McAfee Agent 4.6.
More: McAfee KB ID: KB72080
Any info on V1.7? It looks like only 1.6 is available. I am evaluating and would love to find out if there is a newer version than V1.6 which will which will support Ubuntu 10.04 LTS.
The last information I have managed to obtain regarding the release of VSEL 1.7 is that it is scheduled for ~Q3 this year. My current bet is October.
Hope this helps.