A brand new system update for the Xbox 360 has been rolling out to everyone today (if you don't have it yet, it should be available in a couple of hours). In all, this took me about 5 minutes to download and install onto my Xbox 360, so it isn't a very big update.

As tweeted by Major Nelson, the only change brought along with this is "just an update to default settings that will only be visible to certain users in the EU." There's also likely some behind the scenes fixes, but that seems to be about it.