So, these just got some updated hardware: https://www.boss.info/global/categories/amplifiers/katana/ Appears that these are mostly the same amp, but that they've updated them to include a variant of every amp type (so there are now 10 "voices" instead of 5), and they now use concentric knobs in the effects section to allow up to five effects at once (instead of three). The clean channel(s) has(have) also apparently been updated to be more Fender-like. Tone Studio is backwards-compatible with the previous version, so original Katana patches can be loaded into the Katana MK2 (though obviously not the other way around). Most intriguingly are a "power amp in" option if you want to use these as powered cabs for modelers, and a "stereo" mode for the 100-watt models where two amps can be chained together with a single cable for stereo sound and effects. I think the Katana 100 was a good amp *for the money*, but was underwhelmed with the effects section's limitations. I still think 2 banks of 2 or 4 patches is unnecessarily limited (given the 100 user-assignable presets on the Boss GT-1, upon which the Katana's DSP is derived). This update seems to address my effects section concerns, and the added features look really, really cool (super-simple wet-dry-wet, anyone?). I'ma have to try these out. If it's a solid upgrade, I might have to get a head and convert my Sunn SL260 into a 2x12 cab.