We saw the update first revealed here. We now have the details. Thanks goes to Jordan Htzlx for sending them my way.

"The Kiwi-8P Upgrade features:
512 Tones can be stored and edited. It is also possible to temporarily edit any Tone
Tones are stored in Flash memory so no battery is required.
MidiCC & Sysex support for all parameters and Midi Sysex support for Tone Dump & Load
PG-800 Support for Control of Parameters
Patch Editor support
Key Assign Modes are Poly Single, Poly Dual, Poly Triple, Unison & Solo
Each Key Assign mode can have Rotate/Reassign, Staccato/Legato, Steal/No Steal with five steal modes (Highest, Lowest, Oldest, Newest, Quietest)
Portamento in all modes
DCO Key Assign Detune available in all key modes except Solo.
In addition there is a 'Analog Feel' parameter that add an adjustable small random frequency to each note. Detune is best used with Poly Dual, Poly Triple or Unison keying modes for greatest effect
Three independent envelope generators. These are traditional ADSR type and are modeled on the Original JX-8P. Each ENV Mod can select from ENV 1 - 3 and has an Inverted or Normal modes. These are faster than the traditional JX-8P envelopes