About to, Due to, On the Point of - Other ways of talking about the future

Except the standard "going to", "will", etc., we can express a future action with a number of phrases. Here are some examples:

Be about to  do sth
The ferry is about to leave.
The driver is about to collect them. Shall I phone to stop him?
We’re just about to set off for a walk. Do you want to come?
Attention: When you mention how long from now something will take place, we do not usually use "be about to", but prefer the present tense instead:
Hurry up, please! The train is about to leave!
Hurry up, please! The train leaves in five minutes!
Not: The train is about to leave in five minutes!

Be on the point/verge of doing sth
I was on the point of leaving my job but then I got promoted so I changed my mind.
Attention: after this phrase the verb is used as a gerund, with -ing!

Be due to happen
Used for planned events.
The visitors are due to arrive at the factory at 10:30.

Be to do sth
This refers to obligations, commands and instructions. It is rather formal:
So, George is to contact the Stockholm office, and Patricia is to speak to the Elsico representative. Agreed?
You are to report to the head office by 8.30 am.
She’s not to be late.

Adapted from: http://dictionary.cambridge.org/grammar/british-grammar/future-other-expressions-to-talk-about-the-future