If you haven't noticed the Algo spiked big on that day 10-4-15 and since is still fluctuating. [serpmetrics.com...] For us, this has been the most significant Bing/Yahoo change this year. Why no one in the SEO community talks about Bing is beyond me. The only mention was from an SEW article citing this (Shepard's) post.
Big fluctuations, largest spike was on 10/5 then traffic leveled to normal numbers until yesterday (10/13) when traffic spiked again. Surprisingly the conversion rate also spiked yesterday (10/13), double the normal conversion rate along with increased traffic. They are definitely testing something.
Thanks for the mention, Barry. I wish bing had the resources for more extensive outreach, even if, as normal, they don't confirm or deny an update. It would sure help them raise its profile, and, as ever, i'd like to get more discussion going about Bing amongst webmasters.