Yesterday, Palm released the latest upgrade to the Palm Pre, version 1.0.4 for webOS. Near as I can tell from the release notes (note, really) there’s nothing more than “security fixes” for the phone. The over-the-air update is 12MB and you can either wait for it to hit automatically or force your Pre to download and install it now.
I just ran through the download and install without any noticeable issues. A quick nosing around the operating system didn’t show anything different to me so far, which is expected, but if I see anything different, I’ll be sure to update. Please do the same in the comments if you grab webOS 1.0.4 and see anything new and exciting.