What most intrigues me about the entire assassination part is that if this is anything like Matsui's earlier work, Neuro, there will be an awful lot of emotion involved in that particular scene. He's really good at writing endings, as sappy as they may be, and if AssClass is given enough time to develop all the characters properly it will be amazing.
The plot progression is already starting to show signs of establishing a strong connection between Nagisa and Korosensei, making them both more relatable than many other characters in similar titles. That will no doubt make the serious stuff in the future way stronger. Not to mention that it provides loads of perfect opportunities for entire cavalcades of funny gags.
It's going to be a helluva ride, and the mere prospect of that is enough to make me grin like an idiot. I like Matsui.