You can say "I'm ___ing" to talk about either the present or the future.
In this example:
We're going to my in-laws' house this weekend.
...the speaker is talking about the future. This is a plan which they have already made.
In this example, the person is talking about something that is happening right now:
I'm watching the news.
You have to pay attention to the situation to figure out whether someone is talking about the present or the future.