It's hard to say. Sometimes these things can change at the last minute. Keep an eye on the relevant news and updates from Comic Con or the Zombieland team.
Definitely. The short story served as the foundation for Zombieland. Many of the key elements and themes originated from that source, and the movie adapted and developed them further for the big screen.
No. Fan communities generally strive to maintain a certain level of decency. Fanfic that involves sexual content, especially when combined with a non - sexual source material like 'zombieland', is not acceptable. It can make other fans uncomfortable and goes against the positive and inclusive nature of most fan communities.
Yes, the Ashley Madison affair is a true story. It involved a significant data breach and exposed the personal information of many users of the website.