Given that the LFOs, envelopes, other mod sources and the mod matrix are presumably all digital, that seems like a curious limitation. Or, put another way, they will need the same number of DAC channels to interface between the digital and analogue sections of the synth, regardless of whether it is monotimbral or polytimbral.
Maybe they plan to release a firmware upgrade that enables multi-timbrality, although I bet they have written the firmware with that in mind from the outset - but perhaps holding that feature back is a marketing ploy to create the perception of a bonus extras and getting something else for nothing? Given all the teasers etc, the marketing department isn’t taking a back seat on this one, despite its “skunkworks” or personal-project-of-Herr-Dr.-Ing.
Behringer status (or maybe the personal project angle/boyhood dream angle is a marketing construct as well…or maybe I’m just too cynical but I like Behringer gear, BTW, especially my FCA1616, despite it’s lack of HF filtering in front of the ADC).