v2.70 More user-friendly "error" "page not found", "store closed" implementation?

In the release notes for v2.70 it states "More user-friendly "error" "page not found", "store closed" implementation.". I was wondering what has been changed to make it more user friendly?

"error" and "page not found" pages got more friendly formatting. Store closed page is now implemented as a view (not HTML file)

Andrei,

In changeset 79eb32dfcc07, you rolled back some changes that would have allowed the use of a topic to manage the content of "page not found" page.  Will it be possible to overcome the route issues to accomplish this or is it dead?

I'm not issue that it's possible.

Would it be possible to make all of those pages available to be edited through Topics? Would it also be possible to have them show in the theme instead of a white page without any navigation options, etc.?

"page not found" - It's not possible right now because of some issues with routing.
"error" - I don't think it should be done as topic and shown in the theme. Theme cannot be loaded sometimes (for example, an error could happen in some controller) . In this case error won't be rendered.