The rossum-electro site hasn't been updated in around two years. After the $4,000(!) drum machine was announced,
everything went quiet. I think that the Locutus midi i/o for Assimil8tor was the last module. There was talk of black
panel versions of a few modules, but they are rare. Is Rossum too busy with his Sound Semiconductor business?
I've got 4 devices from them, Mob of Emus, Panharmonium, Assimil8tor, and Locutus and they sound great.
I hope they stick around a while more. They have the best documentation in modular.
noodlehut.bandcamp.com