This is a good news to writers who use Windows.

I'm the developer of Writing Outliner - a Word add-in that's mostly inspired by Scrivener (Kudos to Keith Blount). So If you want to stick with Microsoft Word maybe it's worth checking out:

http://WritingOutliner.com

I think using Microsoft Word + Writing Outliner at least has one advantage - you work on the "end format", you don't have to use a program to write and use another to do the advanced formatting, as Writing Outliner user Derek explained here:
http://writingoutliner.com/forum/topic/attaching-links-to-non-ms-word-files-to-a-writing-outliner-project