Unless I'm missing something, the latest download available on that site is 2.6. I realize it's free software, so it probably is a little cheeky to complain, but it can't be a photoshop alternative if it's not available on OSX. From what I understand, the new GTK broke tablet compatibility for OSX. If anyone knows enough about those issues and the underlying languages and libraries behind GIMP, consider this an invitation to get involved: http://www.gimp.org/develop/

I'm excited about the unified interface and the new transform tool, so here's hoping it is just a couple more days.

That's odd, 2.8 was clearly available when I viewed that page. Maybe you just had an old version cached?

They only seem to offer links to 2.8 for Snow Leopard and Lion, so that could also be an issue.

OK here it is: http://sourceforge.net/projects/gimponosx/