Well, it's not an M13, but one thing that's new with this version is the deep editing options of effects.

"Every Spider Valve MkII effect is fully adjustable up to 7 parameters deep, including pre- and post-amplifier routing. Sculpt your delays, mods, reverbs, pitch effects, and more with unparalleled control."

There is also an option called "Spider FX Infusion" which will more than double the amount of Smart FX in the Spider Valve MkII. This will provide 28 additional overdrives, compressors, delays, reverbs, mods, and wahs.

Check out theh details at http://line6.com/spidervalvemkii/effects.html

The Smart Harmony and Pitch Glide are very cool effects.

"Smart Harmony is our first intelligent pitch shifter. It's fast-tracking and easy to use. Harmonize using major, minor, pentatonic, whole tone, and other types of scales. (Don't worry, you don't need to know music theory to use Smart Harmony).

To get the most out of Pitch Glide, connect an FBV™ MkII foot controller. Use the foot controller's pedal to smoothly shift your tone up or down to any interval within a four-octave range. Calibrate the effect to semitones, or to 10-cent increments to create cool chorus/detuning effects. "