PeopleSoft Portal Solutions 9.1 upgrades are now available.
Please see the following locations in MyOracleSupport for more information:
Portal Solutions 8.8 to 9.1 Upgrade
Portal Solutions 8.9 to 9.1 Upgrade
Portal Solutions 9.0 to 9.1 Upgrade
See this post for more information on what's in this great new release.