Development occurs on a "when it happens" (or less affectionately, "when you code it") scale. There isn't a roadmap and nobody gets paid for their work. Developers work on what they want, when they want to work on it.
Genetics as they exist in SS13 will probably not be directly ported to Wizard's Den, because they are uninteractive by nature. This is a game about people trying to work together to make the ship run, and one person sitting in science plunking away at a machine doesn't fit very well with the design philosophy.
I do think that being able to make viruses would be an awesome tool for the syndicate, but with how viruses are coded right now it would be basically impossible short of a full overhaul of the system- which nobody wants to do right now.