I’m not entirely sure if it is a Premillennial statement about the inclusion of more Jews (a literal Jerusalem) into the Kingdom, so much as it is a statement about where missions today is and where it is going. Jerusalem represents a return to where it started, a system reset, if you will. But it’s not just starting over; it’s also a bringing to a close.

Where it is now is in the “last days” or the final stretch. The task of the Great Commission is getting closer to completion within a generation. Even the latest Frontier Mission journal from the U.S. Center for World Missions speaks of the advances God has made in just the last 40 years where we’re seeing unprecedented progress — especially in the Global South and East.

Jerusalem is important. We only have to read the news and watch the conflicts to see that it is the case. It is the epicenter of the Global South and East where most productive mission is happening. How it will be important is still to be revealed. And this is in concert with what some of the original Antioch planners heard and felt about having a meeting in Jerusalem in 2010.

Here are some of Wolfgang Simson’s thoughts taken from the link I had above that also address your question:

III. Outlook into the future of “Missions” Ideally, all of us wishing to participate in Missions will need to accept that the Holy Spirit is not only the head and CEO of Missions, but we are to accept and respect each other as “commissioned agents” in the same Kingdom Mission. He still speaks and is in control, we follow his orders and are not in control. The prophetic scriptures of the Bible even speak of a time “in the last days” where “the word of the Lord will go forth from Zion” (Isa 2; Micha 4), where Jesus gives directives to those that want to hear them in order to complete the task. In practical terms this means that, for the final leg of the missionary initiative of God, our human Missions headquarters are going to fade in their significance, while the center of Missions will wander back to Jerusalem that becomes, yet again, the final place of commissioning, the last epicenter of Missions. This will not mean that Mt. Zion, a hill west of Jerusalem, will see the construction of an impressive Missions complex, but that God choose and foretold to reveal himself and his directives in Zion “in the last days”. Some of us sensed that very soon God might be calling those from among the nations that he wants to come to Jerusalem to hear and implement his final decrees in regards to finalizing the apostolic Mission of the Kingdom. …

Can the dove land somewhere? God spoke to us about the prophetic significance of the dove landing on Noahs arc, bringing in the first fruit (an olive branch) after a time of judgement. Could it be that the age of Missions made by man is being graciously covered by the waters of God, and he is wanting to bless and therefore multiply the new fruits of a Kingdom shaped Mission? Just as Jesus was riding into Jerusalem on two donkeys, the mother donkey and her colt (representing the old religious system and the new wineskins?), the new moves of God seem to currently receive unprecedented anointing and blessing from God to multiply and “carry Jesus” into his destination.

Hope this helps.