If you use Windows Vista or Windows server 2008 and if you like to try out beta versions this will be a good news. According to Windows Team Blog Microsoft is planing to release both Service packs on 4th December which is tommorow. It will be avalable in TechNet for everyone eventhough they highly recomend beta version only for technology enthusiasts, developpers and IT pros as there might be things to be fixed and finalize before the final release.
Still if you like to try it out you can download Windows Vista Service pack2. Download Link will be avalable as it release.