It contains an unparelleled instance of predictive prophecy: Josiah is foretold by name three centuries before he appears, v.
"Introduction to the Old Testament"
John Edgar McFadyen
Shall is simply predictive; will is predictive and promissive as well.
"The English Language"
Robert Gordon Latham
106. 2. The predictive future.
"The English Language"
Robert Gordon Latham