Dropbox's infrastructure is Go at a huge scale

So the Dropbox infrastructure is now implemented in Golang and Jamie Turner and others are on Twitter talking about it. Not much information in this posting beyond that.

What would be of some interest is a discussion of how Golang (a nice language, IMHO) enable something in the Dropbox infrastructure that would not have been possible in other languages.

Of course, the architecture of the Dropbox infrastructure, which ought to be programming language independent, is much more interesting than the fact that they chose to use Golang.

Can anyone comment on the future of Pyston[1]?

[1]: https://github.com/dropbox/pyston