Often a comic will supposedly launch as an ongoing series but end up lasting all of 6-12 issues and become a, "Stealth mini-series/maxi-series." Not too often, a comic starts as a mini/maxi and is so popular that it becomes ongoing. It happened with the old, "Transformers," comic and was a recent occurrence with the smash-hit, "Something is Killing the Children," but again, it is rare. Hence, it is interesting to see, "Poison Ivy," and her self-titled series went from being launched as six issues, to twelve, to now being a full ongoing.
I haven't read the comic yet, but I've heard good things about it. Written by G. Willow Wilson with art done by Marcio Takara, I have noticed a ton of great covers for the series and as I said, I've been told the plotting and art within the comic are superb. A collection of the first six issues will be released as, "Volume 1," when the 12th issue hits stands and then the 13th issue will roll out after that, with more to come!