The coming WordPress 2.6 (scheduled to be released on August 7th, 2008, or July 7th, 2008) will have more features. Most of you probably heard that about the probably-most-well-known Post Revisions feature. But, there are some other features that should be highlighted. Here are some of them I find (using WordPress from SVN, revision 8094):
Post Revisions

Using this, our WordPress will save a copy of our post everytime you edit it. We can take benefit when we want to revert our post. We can also compare or show diffs from two revisions. Wiki users should be familiar with this. This Post Revisions feature will be shipped and activated by default. If we think that we do not need this, we can deactivate it easily. Just add define('WP_POST_REVISIONS','0');
in our configuration file (wp-config.php
). More info about Post Revisions.
Google Gears supports

Description from ticket #6965 tells about this:
First run. Support for Google Gears managed offline storage. The patch adds all static files used in the admin interface to a single offline storage. That speeds up page loading a lot, as it serves virtually all requests for static files from the computer’s HD instead of the network. So instead of 50-60 requests to the server on some pages, there are only 2-3.
There will be a new small link on the top-right navigation. It says “Speed up!“. Learn more about Google Gears.