So far the best thing that has come out of WordPress 4.3 is the performance improvements for pages. There is a nasty memory issue with having several thousand pages and it is because they are using rather out dated code and it looks like it will finally be fixed. For instance, my gaming site has a hub and sub pages for the hubs while regular posts (news, and videos) are posts. This is not an issue when there are only a couple of hubs but when there are about 6 pages per game and you start adding lets say 100 games... That is 600 pages and performance starts to degrade. Personally I don't like the front end editing for all types of content I prefer my posts and content to be in the back end and from what I can tell it looks like it will all be front end editing.