Blockstream started buying Core nodes to prop up their count several months ago.Node count is up too, from ~5300 to ~5500. I wonder if people are spinning up new nodes because of increased interest or because of SegWit/Unlimited?
As for the real Bitcoin under Unlimited, the count has been climbing, slowly but surely. I'm actually quite impressed, I gained entry in the double digits, now the count is in the tripple digits. If you are a business, run your own node.