Update #2: Xbox Live's Larry "Major Nelson" Hryb has provided on his blog a list of new features arriving in today's dashboard update.
Update: The UK Xbox Live autumn dashboard update is live now, Eurogamer can confirm.
Original story: The autumn Xbox 360 dashboard update is upon us; Microsoft's annual Xbox Live overhaul is happening today.
Specific regional timing hasn't been mentioned. Nothing appears to be available for a UK retail Xbox 360 right now.
This autumn update paves the way for Kinect, which launches in the US on 4th November and in Europe on 10th November.
The big feature for Europe is the Zune Marketplace, which allows music to be bought (individually or as part of a monthly Zune Pass subscription) and streamed through your Xbox 360. That's handy for people who have their console rather than their TV hooked up to their stereo.
Other improvements include a made-over dashboard interface, more realistically proportioned Avatars, better quality voice-chat, an in-dashboard keyboard and comprehensive wireless network support.