Probably not but is it really impossible cycling different oscillator shapes on the REV2 through some modulation?
That depends on what you mean by "cycling waveshapes"... if what you want to achieve is to rhythmically (or sequentially) run thru different set values of the SHAPE parameter, then yes... you can use the Gated sequencers, and route them to the SHAPE parameter, and control the speed of this with the BPM setting/time divisions.
If what you want is to change between the square, sawtooth, triangle and pulse waveforms you cannot... the waveform select parameter is not in the ModMatrix destinations.
You could simulate it though by sequencing the oscillator mix parameter, and then choose the waveforms on each oscillator... combine the two layers for this and you could in theory have a sequencing between four different oscillators with different waveform selections... but it'll be a complicated program to create.