Correct, I had a call logged with JTAC and they sent me D62.1 before it was released. I have been running it for about 2 weeks now without issue.
Current time: 2016-12-20 05:30:36 ICT Time Source: NTP CLOCK System booted: 2016-12-18 13:20:04 ICT (1d 16:10 ago) Protocols started: 2016-12-18 13:20:04 ICT (1d 16:10 ago) Last configured: 2016-12-10 15:37:12 ICT (1w2d 13:53 ago) by arbadmin 5:30AM up 1 day, 16:11, 1 user, load averages: 0.13, 0.10, 0.08
Information for junos: Comment: JUNOS Software Release [15.1X49-D62.1]
So I am guessing that D70 is either a rollup from D62.1 or has additional fixes in it. Either way, it works, we have our devices set for etherswitching (for vlan functionality via irb) and its behaving.