Ok, so this isn't a full one week period yet, but I'm going to be out tonight probably, so 8 hours ahead of time is close enough. These also don't account for anybody who went and picked a specific mirror manually. I could do a much better job, but this is just a quick scrape of the numbers. There are many pitfalls in them, so they are more for interest than serious statistics.
Downloads by bouncer product (no arch breakdown)
'completed' from torrent tracker
www node traffic
For the two machines that serve up exclusively the www.gentoo.org vhost, they normally do 6-9GiB/day in HTTP traffic, and on the day of the release they jumped to 21GiB (and 14GiB for the second day).