Last time they played out the release wayyy too long. I think they took care of all the early stuff before letting us know this time...I appreciate that too.
this, or perhaps something came up and they rescheduled it for this week. Which could mean the song may be released a week later, which could help to understand why the April 16th-ish date was removed.
To me, it makes no sense for them to return to their heavier roots. The music industry is a very different beast right now, and rock isn't really selling.