It's unfortunate that they announced Otto as the "successor to Vagrant" when in reality it seems Vagrant and Otto solve different, albeit related problems. Otto seems like it's solving the high level issues, to introduce a sort of hive-mind conformity; whereas Vagrant solves the issue of efficiently automating the creation of specific environments. It makes sense then that Otto uses Vagrant to achieve it's goal, but it's a bit confusing to call it a "successor" then. Vagrant is a great piece of tooling, and it's good to see that it lives on despite confusing messaging.
Just reading this announcement, it seems 1.8 is an amazing release. The linked clones by the sounds of it seems like it'll solve on of the major issues I've had with Vagrant. Additionally, this little nugget is hidden under minor features, but should really have a heading of its own:
> Vagrant now automatically installs VirtualBox for a smoother getting started experience on Mac OS X and Windows.
Awesome, kudos!