Hmmm I'm a doubter - or maybe I'm just not a fan of Google forcing things on people. Necessary if you have a shopping cart but for many sites it would be an unnecessary expense. Not to mention the transition from http to https can be messy.
User interaction is big and will remain big. CTR has been the most important factor of the Adwords quality score for years, makes perfect sense for them to make use of that kind of data on the search side too. Site speed goes hand-in-hand with visitor metrics because if the load time is unacceptable people click back. Content - yeah, but you still need to promote it. Good content doesn't discover itself.