Any details regarding this? I picked up a pair of 2011's last season and my only gripe is that the toe strap will slip on me once in a while.
The '13 390 Boss will have a new rubber toe strap. Think of the current strap shape with the middle removed and a rubber "x" through it instead. It's designed to fit any sort of toebox you can throw at it.
The 390's are also getting an upgrade to a new open-toe cap strap.
We've ridden both and are super hyped on them. Snowwolf has been riding them and has also been stoked on how they held up last winter.