Couldn't find any info on CME site but they've decided trades will continue through the old closed period (4:15-4:30pm). In other words trading straight through to 5:00pm. Then reopen for night globex session at 6:00pm. 5:00 to 6:00 only timeframe trading is halted. Guess it started a while ago (June 1st?) but I hadn't noticed.
Posted here CME Equity Index Products - Trading Halt between 3:15 and 3:30 p.m (Removed) | Elite Trader
If that is so, wonder why my eMini chart shows data in the timeslot beginning June 1st, and not just from today? But thanks anyway for the link.