You’ve gotta have a Windows box to run the updater, and there is a bit of confusion in the community about what this will do to rooted devices, but if you’ve got a straight Hero and are a Microsoft customer, now is the time to update. Keep in mind that this will *wipe* your device (factory reset). So back up accordingly!
See the update in action (from about a month ago) in the video below. I’m pretty sure some changes have been made since this was shot, but it does look quicker. I believe this is the same update that will ship with Sprint’s Hero.