The 1.0 release has no new features over 0.14.x (the unofficial betas for 1.0) and is available through rubygems.
I will update the FreeBSD ports of rails asap as I already got some mails about the new release. With the new ports updating should look like:
# cvsup /etc/ports-supfile
# make fetchindex
# cd /usr/ports/www/rubygems-rails
# make deinstall clean && make install clean
Updating your applications is described here.
