#1 would = future in the past
#2 would = future in the past
#3 will = future in the present
More information about changing verbs for reported speech (and similar situations such as #2 "he knew" that require showing past-in-the-past and future-in-the-past).
Note that #3 is an example of something that is still true, so the choice of will or would is optional.
This morning, he said he would come tomorrow. [correct]
This morning, he said he will come tomorrow. [correct]