Panther is due for public release October 24th. All features that are known for Panther are listed on:
If you wish a feature to be added to Panther visit
And Apple will consider it, though may not add it.
If you see someone on this board post any feature not listed on http://www.apple.com/macosx/
Take it with a HUGE grain of salt until after October 24th.
If worried about compatibility with Panther of any software, visit the vendor's site which you can find from any of these Mac OS X software search engines and directories:
If you make a mirror backup of your hard drive to a Firewire hard drive that is bootable before upgrading to Panther, you can test for yourself if the software works in Panther, and revert back to the older version of the operating system simply by copying back over the backup. If you find something that doesn't work with Panther, please report it to the software vendor software feedback site, once Panther is released. Until Panther is released, such reports probably will not be helpful since Apple may make last second changes.