Le futur utilise WILL mais il peut aussi être associé à l'idée de mettre l'accent sur l'Activité avec l'utilisation de BE + V-ING ou bien de mettre l'accent sur le Résultat avec l'utilisation de Have + V-EN.

Next year, I'll be working for a big company.
In approximately 10 years' time, I'll have become a business partner.

Let's start with ING Future!

On utilise le Futur en Be+ V-ING (will/won't be + V-ing) pour parler d'actions futures qui sont 

- soit imaginées comme étant en cours dans un moment du passé :

When you start school tomorrow, I'll be going to Brazil.
She won't be working at that time next month.

Don't come too late, after 9pm, we'll be watching a movie at the cinema.

- soit vues comme étant nouvelles, différentes ou temporaires :

Today they are going shopping but next Saturday,  they'll be visiting their grandparents.
She won't be coming to the party while she has the flu.
Will you be helping your brother with his new job?

What about Future perfect?

On utilise le futur perfect (will/won't have + V-EN) pour parler de quelque chose qui sera terminé avant un moment donné du futur. 

The film will start at 8pm. We'll have arrived at the cinema by then. 
Next week, we'll have been friends for 15 years.
Will the baby have gone to bed when I get back?

Le futur perfect s'utilise très souvent avec des compléments de temps faisant référence à un moment précis du futur :

- by or by the time

The boss will have written all the reports by next Tuesday.

My pupils will have finished my test by the time the bell rings.

- in or in a week's time / in two months' time / in fthree years' time ...

She'll have finished in a minute and then she'll watch a movie.
In two days' time, my mother will have gone to Australia.