For the last 4-5 hours we are seeing huge inflow in traffic. Most of these sites are from various niches & were working really hard since the last year's core update. Now it seems they are getting the reward.
But sites from various tech-news related niches, sites which provides quick fixes for common or household problems, sites who doesn't produce their own content but highlight or represents others etc are hit pretty hard. Their traffic rate is down upto 50%.
If its the only case then I would have relaxed. But there is more. Sites with very well planned, researched & insightful content are now ranking very low in the SERP's. These sites doesn't limit to one or two niches. They are from many background and fields.
In the product reviewing or selling sites, its another story. Sites with copied content or even just the photocopy of the seller's actual page are ranking high. In the medicine niche if you are not from big sites or referred by any authority figure then no matter what your articles say or information it holds, its probably never going rank in the first page.
The SEMrush sensors are showing high numbers too.