I think we can expect an eight track synth instrument in the same form factor, announced within six months or so. Essentially, like the Electribes, a companion piece for those who want to dig deeper into that kind of sound design.
I'd say that Elektron is doing what the Electribes did late 90's and early 2000's, but for the next generation instead.
At the end of the year, I wouldn't rule out that you can have a set with the Heat, the DigiTakt and the WaveTangent next to each other, taking up about as much real estate on your desk as one and a half Analog Four / Rytm / Octatrack, entirely Overbridge compatible, essentially a complete production environment. Perhaps throw in a mastering box as well, BandStation, with recording options, and you've got the Black Quartet to match the Dark Trinity.