In those days, etc. The destruction of Babylon is immediately followed by the deliverance of Israel. But the description of the latter is a remarkable one. We are by no means to regard it as an idealized picture of the return of the Jews under Zerubbabel, any more than we can suppose the glowing promises in the second part of Isaiah to have their sole fulfilment in that disappointing event.
No; it is the characteristic of Messianic prophecy that, with "foreshortened perspective," the prophets represent as equally near events which are really separated by ages. In the Book of Isaiah, for instance, preliminary judgments are repeatedly described in terms which, properly speaking, only apply to the great final judgment.
In fact, each great political revolution is a stage in the Divine drama of judgment, which will reach its close in the final cataclysm. And so too here (as well as in Isaiah 40-46.) the promise of mercy to Israel, which began to be fulfilled in the edict of Cyrus, is represented as if the still future conversion of the people of Israel were actually accomplished.
The description reminds us of Jeremiah 3:18-21. Notice the penitence of the returning exiles, and the reunion of Israel and Judah (see on Jeremiah 3:18). Going and weeping; they shall go; rather, they shall go, weeping as they go.