With Microsoft's Build developer conference kicking off in just a week, we're frankly surprised the company is choosing to release any news ahead of time. Today, though, the firm posted a video showing some changes to Office Web apps. In particular, the preview indicates that these various apps will now support real-time co-authoring, with multiple users making changes at once (yep, just like Google Docs). That's a nice, long-awaited improvement over the current setup, in which multiple users can make changes, but not alongside one another. According to Microsoft, this set of features will roll out over "the next several months." For now, we've got the video preview embedded after the break. And don't be put off by the 14-minute length; the demo doesn't actually begin until five and a half minutes in.