WD pulled the announcement they posted yesterday for both the first gen and second gen firmware. You can still see that announcement in the OP post (or in this link). For what ever reason WD pulled the announcement of both firmware’s 11 hours ago from this subforum and the announcements subforum.
WD did something similar with several other My Cloud model’s firmware a week or two ago. They released it, then pulled it and released a newer version a few days later. I can only assume they will do the same here.