The latest that I have heard is the end of this quarter, so late June. We (support) do not hear specific dates until at the most a week ahead of time, usually only a day or two.
One of the things it doesn't fix is the TLS DSN. Instead of the long subject line of "Your Administator etc etc etc" you just get "N/A N/A". Apparently the won't be fixing this until HF7.
Patch 6 is now RTW - so should be appearing on your MEGs.
(You seem to need to upgrade to P5 first, then run a pre-6 patch, and then P6... Readme here: https://kc.mcafee.com/corporate/index?page=content&id=PD23441