Theory: Just like in 2013 when the Indie-go-go DLC voting campaigns divided the fan base into warring factions, I think the 2021 Roadmap is being stalled by those same battles, reignited in the HVS office. They want to announce the next character after Annie but no group has claimed victory yet. Right now, Sairus is leading the Minette faction, dressed in aprons and hands heavy with water balloons, through the burning break room ready to clash with the Hive leader stranded and hiding behind an overturned photocopier.
Seriously though, having to pick from dozens of great characters is no easy task.