Discuss and learn French: French vocabulary, French grammar, French culture etc.
I think that in French you would normally just use the ordinary future tense and rely on the context to show the continuity or otherwise of the what is going on.
There is the expressions "aller être en train de...faire" or ,similarly "Je serai en train de....faire" which would demonstrate continuity in the future more obviously but I think you would be unlikely to need to make this distinction very often.
There is also ,of course the "je vais ....faire" expression instead of the simple "je ferai" expression but I don't see much difference between the two in the sense that you are asking about.
There may well be other expressions I don't know about though....