Tot already mentioned these two Boss pedals that were announced at Namm. I´m gonna get both of them! Bassman & Twin modelings in a standard Boss pedal form... sweet!
The only thing that I think they should have included was speaker sim. It would be very nice to be able to hook one of these up to the mixer without going through a external sp.sim

http://www.roland.com/products/en/FDR-1/index.html
http://www.roland.com/products/en/FBM-1/index.html