"What will happen next?" or "What's next?" are both common English expressions for "下一步会怎么样".
The first one, "What will happen next?", directly translates the question, emphasizing the inquiry about future events. The second one, "What's next?", is a more concise and colloquial way to ask the same thing, often used in everyday conversations. Both are correct and appropriate depending on the context and the level of formality desired.