Not much is known right know, but Latino Review are reporting that the Donal Logue as Jim Gordon story was a mistake, he is playing Detective Harvey Bullock! The mistake was made by Latino Review's Elmayimbe due to confusion in communication and excitement over the scoop
FANBOY NATION! I have an update on the Donal Logue/Gotham story. I was wrong. My bad. He actually got offered DET HARVEY BULLOCK
The story also comes with a character description, Bullock will be in his 40s and will act as Gordon's mentor in the show.
Update
It looks like this story has some real backing now, with Donal Logue himself thanking Elmayimbe for breaking the story! No confirmation that he will play Bullock but it looks like talks are taking place!
.@donallogue Hey. My bad. Sorry for the confusion. Looking forward to you hopefully playing Det. Harvey Bullock. That would be dope!
@elmayimbe ha! No problem. It's only bad if they ain't talking about you
Read more at http://www.comicbookmovie.com/fansites/devlin712/news/?a=93076#RGgERh5RL9o50xLv.99