One can expect a lot more protests and comments, and hopefully there will be more clarification from Google soon. (Tumblr went through this and dropped it.) The lack of clarity as to how questionable content is identified is one thing. Another is the concept that content can be adult but not be sexually explicit in the usual sense – that seems immune now, but what about down the open road?
Update: Later Tuesday
Blogger does have some details on the Product Forums. A user has to be signed on to a Google account to see these details, but the direct link is here. A user should sign on, go to the Blogger Help Forum, and then navigate to all discussions. A posting from Carles PG (two posts now) about a "Blogger content policy change appears". The user may have to click an extra time to see the first posting before the second. Apparently the emails went out to those who had interstitial (adult content warning) pages, regardless of whether there was nudity. Blogger seems to suggest that self-identified adult pages can stay public if they don't actually contain nudity. It's not clear yet how third party embeds are handled, or whether future warning emails can identity specitic posts or images when atypical on larger blogs.
Users of Blogger should visit this forum frequently in the coming days for more details, which will surely be posted.
There is some discussion on line of the vague term "adult content", as here on a webmaster forum. Note the passage of material that is "not for audiences" but then gives an example of a cartoon with see-through clothing. Seriously, "not for all audiences" would dumb down pretty much everything if taken literally. Seriously, some verbal (not image) content is inappropriate for younger minors; when I talk about sensitive issues (which is often), I usually maintain a certain tone of formality and distance to avoid creating "problems". This problem got debated with COPA a few years ago.
One tip in embedding or even linking to YouTube videos. Try playing them from YouTube without being signed on. If you get an adult interstitial (justified or not), consider using a different video. What gets marked on YouTube now probably gives a fair indication of what Google would consider a problem.
It's possible to upload and process video right to Blogger without embedding from YouTube, Vimeo, or other sources. Maybe this is what the new policy refers to; one wonders if content that is accepted on YouTube should be automatically accepted on Blogger. If am embedded video gives an interstitial when played on YouTube, couln't it be set up to do that from Blogger?
Update: Friday, Feb 27
The Google Forum for Blogger has been updated to show a deferral of the policy. See my posting Feb. 27, and revisit the actual Forum (after signing on) as soon as possible for the latest update.