According to this SixthAxis report, Home beta selection is not ongoing in Japan. From the site:
Don’t get your knickers in a twist, but it appears that there’s a big banner on the Japanese PSN Store, Home related, and it’s apparent that if you download the theme that’s in there (it’s only 277KB) you’ll have registered your interest in the Home Beta. You’ll need to do this before the 11th of August, though.
So there we are. No date on a European equivalent.