According to ANN, Shimoku Kio's Genshiken manga is getting a third season which will adapt, in what is sure to confuse absolutely everyone, the second season of the manga even though the second season of the anime didn't adapt all of the first season.
With most of the original cast relegated to supporting roles and the focus on a new generation of Genshiken members, almost all of whom are fujoshi, I expect this might be controversial with fans of the original two seasons.