New version of Akismet plugin was released yesterday: 2.5.4.
Here is the diff between version 2.5.3 and 2.5.4.
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Marko Heijnen are discussing. 
Marko Heijnen 4:26 pm on January 6, 2012 Permalink
Little note is that the define of the version still matched the previous one.
Joseph Scott 4:39 pm on January 6, 2012 Permalink
Thanks, I’ll get that updated.
Ryan McCue 12:53 pm on January 7, 2012 Permalink
Are you planning to update latest.zip on wp.org? It seems a bit unprofessional not having the latest Akismet on a fresh install.
Joseph Scott 7:30 pm on January 7, 2012 Permalink
Historically WordPress has not issued new releases for updates to the Akismet plugin. I’m not aware of that changing at this point.