Definitely an improvement, and this is going to make linking to things on mobile a lot easier as well with how big the current docs are.
There is a reason that a ton of topics under the 'api' tag on together are from new developers who are sending or receiving seemingly correct/incorrect data. I imagine quite a few of those situations will be prevented now that things are easier to find and simply formatted better.
My main issue with the documentation has always been with the outdated, unclear or completely incorrect (for example) API endpoints themselves. So it definitely looks promising and it'll be easier to navigate and link to things. But the #1 priority for me is showing the actual API requests and responses clearly so I look forward to seeing how those will be shown and kept up-to-date on the new docs.