https://www.cnet.com/news/game-of-thrones-season-8-episode-4-trailer-after-the-battle-of-winterfell-hbo-what-next/

In the preview for episode 4, we see Cersei and Euron readying her troops from King's Landing as Dany addresses what's left of their own troops at Winterfell. 

"We have won the great war, now we will win the last war," says the Queen of Dragons with a smile on her face. Not sure how anyone is smiling after the Battle of Winterfell, but sure. It looks like the action is headed south, for more fighting, more ships and ... maybe more deaths?