The new Fast Track interfaces essentially replace the Mbox mini which has been removed from the Mbox interface line-up. The Fast Track interfaces respectively provide one and two mic pres and DI inputs with the Duo also having two extra line inputs on the back. It can be hooked up to a Mac, PC or an iPad.
The Fast Track Family of interfaces comes with Pro Tools Express the entry level version of Pro Tools which is basically Pro Tools LE but with a limit on track count.
The Fast Track Solo will have a RRP of $179 USD with the Duo starting at $299 USD.