Palm issues a new webOS 1.3.1 release for the Palm Pre and the new Palm Pixi which will be launching tomorrow.
The new webOS 1.3.1 mainly bring Yahoo! service integration into Palm Synergy.
According to the Palm Blog your Yahoo! information (such as contacts and calendar events, and messaging) is now integrated with Palm Synergy, along with info from your Outlook EAS, Facebook, Google, and LinkedIn accounts. If you use Yahoo! to manage your contacts and calendar events, it will be integrated into your Contacts and Calendar applications on your Palm Pre. On Sprint, you can also now use Yahoo! IM in the webOS Messaging app.

There are lots of minor fixes and improvements int eh webOS 1.3.1, but no major new feature and also no word about new performance increases or iTunes support.