There's a new "B7" release in the downloads section.
The most important part of this is that it now lets you compile arduino code on a Pi, without having to mess with your Arduino 1.0 installation. In fact you don't need an Arduino installation at all, though its still the easiest way to get the AVR compilers that are needed (and if you want to run on Due, you'll still need 1.5.x).
It should also run on the Tre!
As far as new device support goes, this includes a bunch of drivers that have been around for a while but missed the last release, including Nokia 5110 lcd displays, avrVideo output (see last blog post), Embedded Adventures 7 segment displays (blog post soon!), and midiOut.
Another potentially important change is that the Linux code in version was compiled on Centos, rather than Ubuntu. Centos has a slightly outdated version of some of the libraries which meant that it couldn't run the code from the more modern Ubuntu. The Centos version should run on Ubuntu though (and if you run into problems the old version is in the libexec folder, and you can rename it).
Sniff is a "Scratch-like" programming language that's designed to help Scratchers move gently from Scratch to more conventional languages. They can start writing programs, without having to learn a new language because Sniff is based on Scratch. They learn a little more about variables, compiling, syntax errors (!), and they can have fun controlling real hardware while they're doing it.