Seeing as Blizzard posted in the Bug report forum about it, yes Blizzard is aware. In addition to the post this morning, they just posted an update.
The video was posted there many hours ago along with lots of detailed reports about the Asia season rollover. Complete with pictures.
None of this is news, and so far I have not seen anything about EU issues. They did not have the Season end issues that Asia did which are impacting this new season.