I wrote this article for LWN about what's new in the upcoming release and implications for the larger open source ecosystem:

http://lwn.net/SubscriberLink/638090/0229275ea355532b/

I took screenshots of HyperKitty and Postorius, in case you want to see! The comments have some interesting thoughts as well.

Thanks to the Mailman development team for answering my questions via IRC and email as I was writing this!

-- Sumana Harihareswara http://brainwane.net