Based somewhat on this CNN story:
"State officials need to educate voters about the new procedures. And the press needs to set the right expectations and make it clear that "election night" will likely be a week-long affair this year."
I think this is where the issue will come from. For a couple of generations, we're used to the 'know the answer before 11pm news' because it's typically been spot-on. This year, it's going to take more than an evening to accurately tally those results.