"It's going to be huge, that much everyone needs to know.
"It took us a long time to film this one for a very good reason. But I think there's going to be some things... I know there's going to be some things in this last season that will shock people," Clarke told E! on the Oscars 2019 red carpet.
The eighth chapter of the show comes almost two years after last installment aired on July 16, 2017.
"Game of Thrones" returns for a final lap on April 14.