In 16 voice mode, the PX is said to be in mono, but each note can be panned in the stereo VCA and you can create a stereo field via Pan Spread or modulating pan.
Will the same be true in 32 voice mode?
I think it will yes... as far as I'm understanding it, in 32 voice mode, you get only one sample instrument and one synth instrument going... i bet this is how they do the 32 voices... the engine is not powerful enough to create 32 voices, so each normal voice is probably split in half as to not require more processing power but all the modulation stuff associalted with 16 extra voices (you would need to have 32 times of everything like LFOs and EGs etc. but these are probably a lot less processing hungry).
It is clearly stated in the SOS article, that the normal 16 voice filter section will be bypassed in this mode, and that two of the filters will be used to "spice things up"... it's working paraphonically in this mode, which makes the filter not very useful with 32 voices going thru the same filter like this, but i suppose the filters could be seen as a pair of "FX filters" in this case... with samples you do not always need to route thru a filter as the samples have all "in them" anyway, but to sculpt them a bit with a static analog filter is probably a good thing.
One thing that i wonder though is, if it would not have been a good thing to allow the user to select what types of oscillators to use for those two sound sources... i think that it would make more sense to have two sample based oscillators rather than one of these being a synth oscillator, because the synth oscillator is a lot more dependant on a filter per voice... I predict that the synth oscillator in this mode is not going to be used that much in 32 voice mode because of this. If the synth oscillator on the other hand, was given it's own volume envelope like on the PRO2, then this might be a bit more useful though.
I really hope though, that this 32 voice mode will be something you can choose on a program level... otherwise it will basically be useless...