This is good news and perhaps it makes the idea of creating single page apps more appealing. However the blog goes on to outline possible problems. The majority are obvious - like don't block Googlebot's access to files needed to render the page. The only one that should worry you is:
Finally, the blog post promises that there will be help on Webmaster Tools to understand how Googlebot sees complex web pages - it can't come soon enough.
If you are a web developer you will probably want to remember where you were on the day (October 28th, 2014) that HTML 5 became a standard. But my best guess is that you will just yawn and get on with [ ... ]