In typical Zope style, ZODB 3.8 has been released with little to no fan fare and no information about it on the Zope.org site.
This is the only reference I found to this long awaited release. The big thing we will want to pay attention to in this release is the new addition of blobstorage into it. Now doing large media files can be easy with Zope!
The Plone application Blob includes usage of this new feature and includes a migrator that will inplace migrate ATFile based types to use the new blob storage. This is a huge win for the Zope/Plone community, and it is too bad it is so poorly publicized!