New Theory on Christa ...
Since we know that Christa was Wellington bound, and the group is currently headed that way, it could be possible that Clem reunites with her there.
And in a recent question answered by Gavin Hammon (voice of Kenny), Gavin said that "an incident is going to occur between Kenny and Luke", maybe this pizza or ice cream choice is no longer going to be Kenny vs. Luke, but Kenny vs. Christa? (Because Kenny might snap and kill Luke. <)