I bring good news (and hopefully will not get stoned by the people here for being the messenger this time):
After further discussion with the jury as well as input from members of the community, we have decided to repeal the ban on mpreg content, meaning that you will be able to upload games containing it without having to worry about being disqualified. We do however make clear that, while we will act as objectively as humanly possible in our role as judges, the fact that most of us do not have a preference for mpreg may appear in our feedback to games containing it. If the first year of the jam is anything to go by however, then this impact should be comparably minimal.
The rules displayed on the jam's main page will be amended once Preggo is awake and back at his PC, as he is the only person capable of editing that particular page.
Thank you for bearing with us during the decision making and only beating me up very gently when I was the bearer of bad news. We would also like to apologize for the rocky back and forth on this particular topic - trust me, we are as glad that this is settled as you are.