present simple that does the same thing? < This the first form. One use of the first form is to express a future action or event that is part of a schedule or timetable.
The plane leaves at six.
So then that's it. We wake up at four tomorrow, and we're at the boat by five ready to fish. Let's get some sleep now.
present progressive/continuous form that is used for a future - This the progressive form, which uses the form of "be" as an auxiliary. One use of the progressive form is to express something that is planned or arranged.
We're waking up early to go fishing tomorrow.
There's also a progressive form which uses the second form of "be". This progressive form is used to express ongoing actions, events, or activities in the past, and it can also be used with reference to the present or future as part of a second conditional (hypothetical present or hypothetical future - distant possibility).