I've noticed that not too many people have putting in meeting topic requests, so I thought that if anyone's interested I'd volunteer to throw together some slides on BtrFS.
For those of you who haven't heard of it, BtrFS is the next generation linux filesystem. Though still in heavy development, it was included in the mainstream kernel last year. It promises to scale to filesystems well beyond what any of the current offerings can handle (including ext4), as well as offering far greater flexibility and better data security for data admins.
If you have anything else that you'd like to hear about, either instead of or in addition to BtrFS, chime in, and hopefully someone else on the list will be able to make it happen!