Googlebot is visiting my website via IPv6

Interesting: Googlebot is visiting my website via IPv6:

2001:4860:4801:1303:0:6006:1300:b075 - - [22/Nov/2010:16:46:21 +0100] "GET /newsserver.txt HTTP/1.1" 200 1966 "" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"

2001:4860:4801:1402:0:6006:1300:b075 - - [23/Nov/2010:04:49:22 +0100] "GET /robots.txt HTTP/1.1" 200 26 "" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"

2001:4860:4801:1402:0:6006:1300:b075 - - [23/Nov/2010:04:49:23 +0100] "GET /mmm/bla.txt HTTP/1.1" 200 5911 "" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"

Note the two different IPv6 source addresses:

2001:4860:4801:1303:0:6006:1300:b075

2001:4860:4801:1402:0:6006:1300:b075

I wonder how Google handles the information found on IPv6-only websites. Will Google reveal IPv6-only websites via ipv6.google.com?