The hope is that it'll add a lot more power and flexibility to commenting. A better editor, threading, avatars, rating, etc. Also, the moderation tool can be used from email without logging into the site here, so I'll get better turnaround time when I'm not at my computer.
Very easy to back out, unlike Disqus, so if things don't work out I'll just deactivate it. But give it a little while.