Since WordPress 3.9 the TinyMCE editor now automatically cleans out all but the semantic HTML from Word (or Rich text copied from elsewhere), meaning any fonts, styles, etc. You preserve headings, blockquotes, lists, links, bold, italic.
From: Peek in the SPLOT: TRU Writer
This means WordPress handles text pasted from word a lot better that the current WordPress 2.9.2 does
Even though, like Alan, I don't think writing everything in word is a great idea lots of folks do exactly that. This then should be useful for #glowblogs after the upgrade.
I'll be posting a few things here about the changes in glow blogs coming in January over the next few weeks.