"It is going to be" etre: to be va (aller) + infinitive : indicates near future Not: "ça sera" can be translated as "it will be". "aller + infinitif" is more certain and more near to present when compared to previous.

Salut David, It means 'it will be' as in: Ça va être une belle saison It will be a beautiful season Ça va être très chaud It will be very hot.