Only speculations, but:
6 tracks might suggest 4analog machines + 2 digital machines.
the digital machines could be digital oscillators (MM style) or FXs to be used in drop chains as in the octatrak using Follow machines (6 tracks).
Also the tracks could be used with complex CV and fx routings.
Let's not forget that this is suppose to be the first of a new line of products, therefore I can see additional modules and voices to be added in the near future.
Sounds very sexy and expensive, lets hope for the Elektron HQ to spill their beans as soon as possible... christmas is approaching!!