User blog comment:Chrono Nexus/The Chunin Exams/@comment-26461986-20130424030503/@comment-3454557-20130424104513

The limitations on the rinnegan and sharingan are still valid, since this is still a roleplaying event. For KG, I'll approve or disapprove on a case-by-case basis. I'm looking for KG that are unique, aren't substitutions for character skill or player ability, and don't enable a character to exceed what their ninja rank would indicate. Having KG-specific techniques and a KG replaces your B-rank specialization and the associated A-rank technique: mastering the basics of a KG represents an allocation of time, training, resources, and effort that could be spent in other areas of development. TLDR; nothing OP, has to be unique or a unique interpretation, and there is an opportunity cost for having a KG.

As for your other questions: I haven't set a date. I'll start it when I feel the time is right- when we have enough genin to start, or if it becomes impossible for us to add more genin without waiting too long. This exam is being hosted by Konoha, under the watchful eyes of Hokage Uzumaki Naruto.