Multitouch was one of the most requested features on Android, at least until the Nexus One gained multitouch browsing last week.
The bad news: the update won't add the ability to install live wallpapers, a coveted feature of Android 2.1 seen in the Nexus One.
The point of live wallpaper is essentially to let your homescreen behave like an application, making it animated and interactive. Live wallpapers have the same access to the platform functionality that apps do, giving your homescreen the ability to change dynamically and to bring relevant information to the background of your phone. There's no word on when or even if the Droid might support live wallpaper, but it looks like it won't be included in this upcoming update.
Other tidbits from the new build -- based on Android 2.1 version 1 -- include pre-installed Google Goggles experimental visual search, and versions of the news and weather widgets first included with the Nexus One.