Some other interesting nuggets from the manual:
The Low Split point can be set to whatever key you want... this is good, and does make the 44-keys more versatile, if playing two handed with a bass root or octave, and harmony/melody up high. Appears its saved on a per patch basis.
Lots of alternate tunings / global tunings available.
Separate Osc 1 and Osc 2 polyphonic glide controls
Like on Pro 3, the Velocity on/off switch is a proportional 0-100% application of velocity to env amount. This is sort of a blunt force option for velocity control, but you can use mod matrix Velocity routed to Env Amount to dial in a smaller amount of velocity.
The LFOs do extend into the audio range... not specified exactly how fast they can go. On the other side of things, Osc can be routed like an LFO, but at higher audio rate, and its unclear how low Osc 2 can go in pitch/freq with key tracking off. Seems overall, a good amount of flexibility for the hardware design constraints.
Triangle is the only bipolar LFO, though you can use DC offset to make any of them bipolar, or to make the Triangle unipolar.
Poly LFO + Global/Mono LFO both can clock sync and have key reset / key sync options.
Unison does have selectable voice amount, and unison detune.
In digital effects, there's Tape Delay 1 and Tape Delay 2 modes... not sure I've seen those before.
Also, there is a High Pass filter in effects... while not as nice as Poly HPF like Prophet 6, its nice to have option here.
Arp has option to output arp notes via MIDI... this was added to Pro 3 a while back.