As of right now, it is not in the main development pipeline which is about a 3 to 6 month view. But if there are some demands (I guess we could count this post as one) things might change.
This is the official position, now that beeing said, we have some developers who are IntelliJ aficionado, You never know what can come out of some personal initiative.
Yes, please count this as a demand to create an IntelliJ GreenPepper plugin, it would be nice if individual GreenPepper tests could be ran directly in IntelliJ, it would drastically cut down on the feedback loop.
I will patiently keep my fingers crossed, you guys keep up the fantastic work!