1. Prediction.
At the present time we expect something to happen.

2. Future fact.

• Will can be used with a verb + ing to say that something will be in progress at a future time.

We'll be waiting for you.
• Will + have + past participle is used to talk about something completed in the future.

By this time next month we'll have finished writing.

I haven't got time to meet him tomorrow.
OK, I'll meet him myself.

• Going to is used to refer to a future events for which we have present evidence
• Going to can suggest great determination

They are going to become the leading database software developers.

• The present simple is often used in connection with travel or other activities that involve a schedule.

The plane to Minneapolis leaves at 15.05 and arrives at 18.15.
• An infinitive can also be used to talk abou it definite arrangement; it makes arrangement sound offcial.

You are to be here at 9.30.
We are to see Mr. Kaffenbenger at his office tomorrow.

When are you going? On Sunday.
I am seeing the secretary tomorrow.

The company will be 50 years old next Monday. (future fact)

The Company is 50 years old next Monday. (absolutely definite)

We are going to establish a joint venture in Moscow. (intention)

We are establishing a joint venture in Moscow. (plan)

We're going to become the world's leading software developer. (intention)

We will become the world's leading software developer. (promise or possible future fact)

• We do not use present continuous to make predictions nor to make promises.

Note. However this is acceptable in AmE
• It is not possible to announce spontaneous decisions using going to / the present continuous / the present simple

Note. However first two are acceptable in AmE.