Joseph Scott who is working on the Akismet plugin for WordPress notified everyone via the WordPress core development blog that there would be some changes coming to Akismet, starting with version 2.5. In version 2.5 of the plugin, there will be some new files added such as admin.php, akismet,css, akismet.js, and widget.php. There will also be a test mode included with 2.5 which can be activated when WP-DEBUG is set to TRUE or when AKISMET_TEST_MODE is set to TRUE. When test mode is enabled, comments marked as spam will not be sent back to the Akismet servers for learning. There will now be a spam check history section where each comment and interaction that occurs with Akismet will be displayed. Each comment will also have an indication as to what Akismet did with the comment.
There are a number of other improvements as well mentioned in the blog post. Anything you see that perks your interest?