I agree. I (want to) believe the most likely scenario is:
- Curtis analog filters, VCA
- User sampling
- A new-to-this-generation, Interesting real-time control of the sampling (with respect to full-key boards)
My guess/hope:
- DCO like Rev2
(I don't think P6/OB6-style VCO & discrete filters are likely.)
I don't believe this will be multi-level sampling. If it is, I'd be impressed. (Hard, but possible, to manage on screen.) If it is, I see it being 4 levels deep.
I think, in some sense, the 8dio relationship will be like relationship between Nord's library & its keyboards. In that, a bunch will come in board; more of those can be swapped in.
And, user samples, can also be added. ... I suppose there exists the possibility user sampling is "too much" for this one board; & the X lacks it.
I don't think it would be digital filter/VCA.