下一周你们打算做什么英语怎么说?

what do you want to do next week?

What will you do next week? 或者是：What are you going to do next week?
绝对准确无误哟！

What are you planing to do next week?
What are you going to do next week?
What will you do next weekend?
What do you plan to do next week?

这四个都可以，意思表达都和你的提问相符。

What are you going to do next weekend ?
What will you do next weekend?

我来加个生活化一点的:
what's gonna happen next week?

what do you plan to do next Monday?