Will Boris Johnson be the next UK Prime Minister?

He is certainly odds-on-favorite. And the fact that he is a hard line Brexiteer and a very charismatic one, especially after Nigel Farage's Brexit party did particularly well in the European elections, means there are a lot of Tories that want to keep the Conservative Party together that are going end up supporting him. It is his to lose. He is very capable though of losing it.