Today is a happy day for both consumers and developers alike. Not only have the full set of SDK tools finally been released in their golden final versions, but it is literally the final countdown to the launch event world wide come January 30.
The Gold SDK tools means that apps developed with this toolset will be ready for launch when the day comes. No API changes, no more unexpected deprecated classes. It means that developers can focus on making their apps the best that they can be and work out bugs to ensure quality apps at launch instead of buggy ones that break when the final release comes.
If you are a developer, make sure you download your favorite tool set and get cracking on some apps!