Just heard back from McAfee. It seems they are still progressing with an EOL date of Sept 2018 for ePO 5.3.3. (Seems a waste to only support that patch level for a year, but, so be it.) The are now recommending moving forward to ePO 5.9, Patch 9 (5.9.1?) although Patch 1's RTW date is not yet known - the word was, if we can 'wait for it', 'wait for it'.